D'Souza and Shapiro are dangerous in their own right, and they are far right. I don't like anyone who bases their politics on pseudoscience, superstition, and religious tradition.
Also, the Alt-Right now constitutes a large part of the Republican voting base. The Republicans in office are not Alt-Right, but they are further right and more extremist than in the past, largely because their extremism seems more acceptable now.
Trump is Alt-Right. He may not identify that way, but he is. He's not a liberal, and his views have changed. Even if he hadn't changed positions on issues, members of the Alt-Right often hold more social democrat positions.