A major mistake on Cruz's part. One which will cost him the nomination.
What Cruz did was politically incorrect, like pointing out that someone has a hare lip. While obvious to everyone, pointing it out makes one look churlish.
Of course Trump has encouraged his followers to commit violence, even at one point offering to pay the legal fees if anyone were to be charged as a result. But Trump NEVER encouraged his OPPONENTS to commit violence against him or his followers, only the other way round, so he is innocent of that particular charge.
Cruz gets points for telling the truth about Trump yet again, even if it goes against the grain of the Trumpnotized among us.