Trump didn’t go after Cruz, Cruz and li’l Marco started it in the debates. Besides, Trump is going to have 1237. Cruz can’t even see that number, let alone achieve it. Lastly, beggars can’t be choosers - small dawg has to ask the big dawg.
There was absolutely nothing wrong with Cruz going after Trump on his liberalism. Trump, however, resulted to gutter politics and smears because that’s his MO.