I admit I haven't read the thread closely, but my take on it is that some people are trying to dispute the meme that Trump is responsible for any increase in hate crimes since his election. I think that's a fair position to hold since there have been other increases in the last decade and the same people aren't holding President Obama responsible for the increase.
If anything, in this specific case (the threats against Jewish centers and vandalizing Jewish cemeteries), I really don't see any reason to hold Trump responsible. Trump, for all his other innumerable faults, is certainly friendlier to the Jewish people and Israel than President Obama ever was.