Yup, this is my feeling exactly.
The one explanation that I've heard that got my interest was that Oswald might have shot Kennedy as a means to immigrate into Cuba. The theory is that some of his shady Cuban contacts might have represented (truthfully or not) that they had Castro's ear, and once Oswald knew he might have a shot at taking out Kennedy, he offered to snuff him in exchange for asylum there. Oswald carried out the actual deed alone.
That's close to what I've been arguing for decades, but with a slight twist.
Instead of Kennedy being the enticement to get into Cuban, think right-wing General Walker, who argued that one army division would be all it would take to overthrow Castro.
Then all his summer in New Orleans activities make sense, he's deliberately picking a fight with anti-Castro Cubans to get arrested for his cause, he's starting an illegal chapter of the Fair Play for Cuba Committee, he's handing out leaflets in a variety of places for the FPCC, he's going on the radio and tv, he's offering his skills to the WORKER and MILITANT newspapers - all to build a resume.
Before going back to Dallas, he tries to wedge the door open further by going to Mexico City and applying for a visa to visit Cuba on a purported trip back to the Soviet Union. That's his escape hatch after he kills Walker. But the Cubans tell him he'd have to get approval from the Soviet Union, and Oswald gets angry, and tells them they are petty bureaucrats getting in the way of the revolution.
This is too early for him to be talking about assassinating Kennedy, as the trip wasn't finalized yet, and there was no way of knowing whether there'd even be a motorcade, as some of the logistics still needed to be worked out. And of course, Oswald didn't have a job at the Depository yet, and the motorcade route hadn't been decided... from the point of his Mexico City venture until mid-November, Oswald's plans involve assassinating Walker, not Kennedy.
It wasn't until the weekend of 11/16 - 11/17 that the newspapers start carrying preliminary reports about the motorcade route, and Oswald could begin to contemplate shifting his sights to Kennedy AND Walker. Kennedy was a target of opportunity. Walker was a long-time target who Oswald once compared to Hitler, and he said the world would be better off without Walker, as it would have been without Hitler.
Walker and Kennedy's politics intersected at one point and one point only, both were in favor of removing Castro from Cuba. Oswald's stongest influences was what he read, like THE WORKER and THE MILITANT (rather than any people he knew), neither of which painted Kennedy in a kind light. And Oswald once told Michael Paine, that if you read between the lines, you'd know what they wanted you to do.
Mr. LIEBELER - Did you know that Oswald received mail at your house from Irving, Tex?
Mr. PAINE - Yes.
Mr. LIEBELER - Do you know what kind of mail he received?
Mr. PAINE - I suppose he used it as the mailing address for most of his mail until he would receive, get a permanent address, so he received the Daily Worker there, or The Worker, and also, I didn't see it come, I don't generally see the mail that arrives there. Most of my mail would arrive at that address even though I was living somewhere else because I also didn't feel permanent in my other addresses, so Ruth would collect the mail and separated mine into a separate pile. I didn't see the Militant arrive. I did see various Russian magazines, Agitateur, maybe a very large one. A very large one and the Daily Worker, The Worker.
Mr. LIEBELER - Did you ever discuss these publications with Oswald?
Mr. PAINE - Yes, we talked with regard to the Daily Worker. He said that, he told me, that you could tell what they wanted you to do, they, a word I dislike, what they wanted you to do by reading between the lines, reading the thing and doing a little reading between the lines. He then gave me an issue to look and see. I wanted to see if I could read between the lines and see what they wanted you to do.
Mr. LIEBELER - Did you read the particular issue that he referred to?
Mr. PAINE - I tried to. I don't think I had very much patience to go through it.
Mr. LIEBELER - Do you remember what particular issue it was?
Mr. PAINE - No, I didn't notice.
Mr. LIEBELER - Can you set the date of this discussion that you had with Oswald?
Mr. PAINE - That was fairly soon after his coming back. So let's say the middle of October.
Mr. LIEBELER - Did he discuss with you, your ability or inability to determine what they wanted you to do by reading between the lines after you had read the publication?
Mr. PAINE - No, I just handed it back to him.
Mr. LIEBELER - Was there anything else said between you at that time on that subject?
Mr. PAINE - He asked me how did I like it.
Mr. LIEBELER - What did you say?
Mr. PAINE - And I tried to be polite. I said it was awful extreme, I thought.
Mr. LIEBELER - Did he respond to that?
Mr. PAINE - I think that was the end of it.
Here's some of THE MILITANT, as republished in the Warren Commission volumes of evidence:
http://www.history-matters.com/archive/jfk/wc/wcvols/wh22/html/WH_Vol22_0295b.htm (next ten pages or so).
And a few pages of THE WORKER:
http://www.history-matters.com/archive/jfk/wc/wcvols/wh22/html/WH_Vol22_0305b.htm
Hank
EDIT: Found this online (THE MILITANT Back issues for all of 1963):
https://www.marxists.org/history/etol/newspape/themilitant/1963/