He did endorse the would-be murderers. Major news networks literally played video of people on the floor of the chambers saying "Ted Cruz wants us to do this". https://www.google.com/search?q=cruz%20wants%20us%20to%20do%...

And the guy that got caught telling people to assassinate AOC during the riot, blamed Trump in hindsight; while his prior tweets made it exceptionally clear that he did it of his own volition. That's called trying to blame someone else to save your own ass, blame shifting.

Democrats tried even tones for decades without much to show for it.