By blaming the victims for the actions of their attackers.
Really, what did Sen Cruz say? The only thing that I read was that Sen Cruz simply stated the truth.
To quote from the NY Times: Mr. Cruz began by saying that the “protesters who took violence into their own hands” were responsible for the episode.
“But in any campaign, responsibility starts at the top,” Mr. Cruz continued. “And when you have a campaign that disrespects the voters, when you have a campaign that affirmatively encourages violence, when you have a campaign that is facing allegations of physical violence against members of the press, you create an environment that only encourages this sort of nasty discourse.”