Have you seen body cam footage before? Even if someone being arrested for DUI or something, if they turn around and stomp on the cop's foot, or spit in their face, or shove the cop... that is assault. That's where the 1,000 number comes from, which is criminally accurate I'd imagine.
Please go watch some basic footage of Jan 6 and tell me there aren't dozens if not 100+ more cops that were being assaulted, like... not in the nice assault way either. Again and I'll stop repeating it, I think Walz's summary was realistic. If you don't then that's ok, too. I thought his larger point is accurate as well... President's words matter and what we saw that day was a result of election denialism and stirring up his supporters.