At this point, unless there's full video of an event like this in its entirety, I don't believe a single thing anyone on either side says. I fully believe an anti-Trump protester would make up a groping charge just to try to make Trump and his supporters look bad. I also believe some of the Trump supporters might get a bit overzealous and do something wrong as well.

But, without full video, everything is inconclusive. From the video clip I saw, the girl claimed an older guy groped her, the older guy denied it so she tried to punch him and got pepper sprayed. The only crime on the video was her throwing a punch.
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"Returning hate for hate multiplies hate, adding deeper darkness to a night already devoid of stars." - Martin Luther King, Jr.