We had the "BLM" protests a few years back. I think some PDs made some adjustments, and of course the rank and file lost a lot of morale, so there is that. The adjustments made in my view were "for show", hey, we did something. And the protests/riots etc. just disappeared. There was no concerted real effort to protest anything. Now was anything of value changed as a result.
Around here, we had protests against "Cop City" for a while, one protester was shot and killed. The police say he had a gun. Anyway, the protests have disappeared and the training facility is being built now. Maybe one or two folks are outside holding signs, it's out of the "news".
Obviously, having a handful of people disrupt some baseball game for charity isn't going to change anything at all except get them in jail for a night. Yay.
If a protest is sustained and large and reflects fairly common public opinion, it may result in real change. Maybe. But I'd argue it's because of public opinion, not the protests so much.