Assuming there was actual support in the first place. If there was, it wouldn’t have to be pushed so hard.
I think a lot of Americans are risk-averse and saying they support BLM is the easy answer to give. Imagine for most of us seeing an employer-based survey asking if one supports BLM. To say, "no" would be a career-killer.
As I said on another thread: Gee whiz. Y’know, a thinking American might be getting a sneaking suspicion lately that the radical response to the virus — lockdowns, quarantines, making people with masks seem ordinary — appears uncannily like a plan some group or other might come up with to clear the way for riots and unrest in case some sort of an outrage occurred. Like for example if a black person died in police custody and the media made a massive deal out of it.