There is no question that these activities increase the risk of the infection spreading more.
Yes.
Since racism and policial violence seem to be - in this context - an exclusively American problem, there are no possible benefits in sight for protesting in France, Australia or in Bangladesh.
Well, racism is not an exclusively American problem, but it does seem to have a political connection as well.
The protests that are going on around the world were triggered by the murder of George Floyd, but they do focus on local issues/injusttices as well. The ones in my country were trying to observe social distancing, but that didn't fully work, so protests were shut down early because they violated the distancing rules. Many people were wearing masks, so that might mitigate the spread somewhat, and the fact that the number of infected people has come down a lot also helps. However, I'm also afraid it could throw us back to locking down again, in the middle of the process of gradually unlocking the economy.
The pandemie can only win.
If we act foolishly, yes.