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What's tricky is how to answer the question; "what should action should be taken against those involved."
There is a stance you can take that removes some of those problems, which is "the purpose of civil disobedience/protest is to knowingly break the law and invite it to punish you in order to highlight the validity of your cause" i.e., if you being punished for your actions causes enormous public outcry then you have succeeded, but the crux of this kind of protest is taking the personal risk by willingly putting yourself on the wrong side of the law and daring it to punish you.
Yeah. Surely the overall point and message he needs to convey is easy.
What's tricky is how to answer the question; "what should action should be taken against those involved."
Then you're into wishy-washy shit with an answer along the lines of, "I support the police in whatever decision they take / it's not my place to tell them how to do their job"