I'm wondering how a social worker could be on "active duty", let alone in a violent protest. I'm also wondering how a member of the emergency services on duty could be arrested.
Without details your claims do not make much sense, including your claims about precedents and likelihood of conviction.
I might be misremembering the likelihood of being convicted with "riot", but from what I can remember, several people were convicted with riot in the 2016 unrest; they were later acquitted several years later through costly appeals.
With prior cases as precedent, and with how loosely the law is written, the chances of them not being convicted after being charged is slim.