Nice post, but you completely missed the point.  I didn't say officers weren't assaulted prior to the existence of BLM.  Sorry you're having a hard time understanding.

The issue is the INCREASE in assaults on police officers during the last few years.  According the article, that increase is partially attributable to a "growing hostility toward police."  BLM and their sympathizers have certainly generated a lot of hostility toward the police.