Earlier quoted context omitted.
I'm pretty sure that motorcycle helmets with active noise control would help a lot. Also maybe padded bodysuits. But there'd be downsides for protest groups to show up wearing such gear, no?
I think protesting is a largely useless endeavor. It's nothing but a "show of force" in meat-space, that allows the possibility of violent encounters between individuals that have opposing world-views/opinions. Rather, allow people to vote directly on issues that they are passionate about. This leads into direct democracy and is arguably a whole lot more ethical than what we have now.
My (minor) successes on policy work happened when my whole tribe showed up to testify at hearings, repeated.
To see how this works, attend any public hearing regarding puppies, kittens, kennels, etc. Whereas most hearings have no audience, attendees, the kittens pack the chambers. And the advocates will get their way.
(I've done the street level protests. It feels nice, validating to be around others who agree with you. But mostly it just makes you a target.)