Citation needed. I think most cops are just normal people trying to earn a living.
https://www.instagram.com/p/CAqt_gHgAxk/?utm_source=ig_embed
https://www.nbcnews.com/news/us-news/new-video-appears-show-...
Police swear an oath to uphold the law and it’s ostensibly their job to, when observing illegality, say “hey knock it off.”
Protesters do not swear an oath as a prerequisite to protesting. Protesters frequently do speak out against- and even forcibly prevent- looting and vandalism within their ranks, but if they don’t, it’s not a dereliction of duty in the same way as when cops ignore abuses in their ranks.