The problem, which shows up in plenty of posts on social media, is that people's concern should, first and foremost, be the excessive use of force by US police officers, and the lack of accountability that officers face, in particular when black lives are lost as a result. Sure, destroying things this is bad, but black lives matter.
I grabbed this quote from your reply specifically because it seems to make the claim that people who belive in social justice are delusional, heavily-biased, and are entirely or at least largely in support of looting. I've never seen anyone make the argument that looting is helping the cause. What I have seen is arguments that acknowledge the 'badness' of the looting, and point out that the same arguments are not being applied to the police.
"Funny how one bad protester labels the whole movement, but a few bad cops are never supposed to represent all cops." -@aStatesman (Twitter)
In fact, there are plenty of videos people have posted of protesters stopping looters in various places. This tweet has one, but there are many in the responses to that tweet as well: https://twitter.com/gryking/status/1267101707596632066