If this guy's story rings true then he most definitely was mistreated. At this point I want to believe him a whole lot more than I want to believe the media.
Have you ever exercised your right to "to petition the Government for a redress of grievances"? Written a strongly worded letter because you felt you or someone else were being treated unfairly or unlawfully? Participated in a march or rally? Exercised any of your U.S. constitutionally protected rights?
I ask because there is a phrase within the first amendment which makes the protection of your rights conditional upon your "protest/petition" be
peaceful or in the very least, not be violent
.
Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievance
Most people aspire not to get arrested, but if you're too simpleminded to not think through your actions, knowing that multiple bad things could happen in the event that things get heated, out of hand and/or violent, then you shouldn't cry about it, after the fact.
The Civil Rights movement during the '60s involved a lot of Black people and allies protesting and marching due to the way African Americans were and still are, routinely mistreated. They did so knowing that they could have police dogs set upon them, be beaten by the police, attacked with high-power firehoses, and certainly arrested, in some cases for simply sitting down at a lunch counter and wanting to be served food.
So I would hope you would understand why it's difficult for some of us to have a whole lot of sympathy for those who are responsible for their own self-inflicted wounds, even if they were spurred on by Trump's lies.