It's not a click baty title, it's accurate and to the point. He is a faculty professor who heard that armed police were approaching his students, and so he went to the protest as he was worried about their safety.

As soon as he arrived he was pinned to the ground and arrested with the rest of the students and several other faculty members.

Was the person arrested for speech alone?

Maybe read the article?

If so they should talk to a civil rights lawyer.

Which takes a lot of time...... Time in which more people will be arrested under false pretenses. This is the entire purpose of having a free press, so that regular people can broadcast the criminality that the government would rather be kept quite.