Ok, you keep wriggling, trying to make out that by 'obliged' you meant that everyone is 'constrained by a force of necessity' (which, incidentally is demonstrably untrue), rather than required by law.
I doubt anyone believes you, but, if you need that to save face, knock yourself out.
Yes, I've had plenty of dealings with the police, in political (e.g. marches and conter-demos) and non- political (e.g. football) contexts. Including being arrested and detained (albeit released without charge).
And, for the record, I've not been a student for 20 years, and I've never carried a Socialist Worker banner!