I think there's a lot of interesting points in the study, especially strong liberals having the 12% increase, which I didn't expect. As to Trump supporters, I agree a lot of the views are hateful/repugnant. But silencing speech has always been a very slippery slope. Labeling hate speech has used against leaders like Malcolm X, who had the FBI spy on him because J. Edgar Hoover labeled the Nation of Islam a hate group. Louis Farrakhan is labeled by the SPLC as an extremist, which I've seen a lot of disagreement with in my circles.
People have disagreements over whether Farrakhan should be labeled as an extremist, but the moment you slap the "hate speech" label on someone becomes a slippery slope for the other side to censor and weaponize views. This one from Erik Nielson in NYT informs my views on it -- it's a catch 22 where you don't want to legitimize hateful views, but where you draw the lines is personal. Is it better to be more conservative about the label? I don't know, but this is a good argument.