Maher's entire point is that those niche viewpoints might not play well in the general, and in this era of social media you can't expect the primaries to not play a role in the general. So why risk it? Supporting minority rights is one thing. Talking about prefered pronouns is another.
...and how many people will say "Well, I was going to vote for woman who emphasizes prison reform over the ignorant career criminal, but she said that she liked to be called "she" at a LGBTQ forum a year ago, so ignorant criminal it is."
My guess is, not many. Beto's mandatory gun confiscation is dangerous ground, as is Sanders' push for banning private insurance. Those actually effect quite a few people who have done little to nothing wrong, and that always frightens people.
Yes it is. Do you think that most people would agree that felons in prison should have that right while they are paying for their crimes?
ETA: Once they're out, however, that's a different matter.
The problem with Maher's approach (in general) is, again, that he glomps onto reactionary framing.
How many Boston Marathon Bombers would be voting? Compared to, say, folks that got caught with too much weed? Granted, I'm in favor of full-scale prison reform, but even I can see the obvious counter here. *The* Boston Marathon Bomber will not be swinging any elections, and any conservative that whines about "well, what about child rapists?" can be quickly reminded of Dolt 45, Roy Moore, and so forth. Seems to me that the party that desires putting child molestors in power are on shaky ground.
We can discuss this about other issues where Maher weighs in as well - his claim that he thought Obama would be "gangsta", his whining about "PC police" and the nonexistent "cancel culture", and so forth. He can claim to be "progressive" to his heart's content, but he's the guy that helped boost Milo the child rapist enabling apologist for white nationalism.