Most people aren't saying that and I would suspect that a large proportion the population have a minimum of sympathy for the cause if not actual support.Never a good time to protest against racsism it will upset the chattering keyboard classes.
The issue is that we have a highly infectious and deadly virus that is currently prominent and in some areas, before the these protests, the r0 is rising.
Talking hypothetically, if say 100 - 500 people died as a consequence of these protests would it be acceptable or worth it? What if the figures were higher?
Admittedly, I'm talking arbitrary numbers and I really hope nobody does, but as I've said numerous times this is a balancing act between two deadly things.
If we are going to have protests then fine, but it's not unreasonable to consider that they should socially distance and that they consider any said consequences.