The OP does not define the actual intent of the few perpetrating the misdemeanors. Any large gathering contains a spectrum of opinions. And any large gathering is a magnet for people of one single opinion, criminality.
And in the era of post truth, are you sure they are not of the opinion that Trump is OK, and placed there to discredit the gathering?
By their nature, you won't be able to tell which. And either way they rely on that - ultimately.

Yes be outraged. On the principle that Muslims should be more vocal, some are, so should the anti-Twitler cohort. There has to be a culture of openness to dilute the extremes. Otherwise we become complacent.

Farcebook is a conduit for the "drip drip" methodology so successful with Bexit & Trump, but it goes both ways. Start dripping - PAL!