And why should i have to prove my innocence. You will probly tell me in latin innocent until proven guilty. Not the other way round, right?
So you are completely ignorant about the laws of the country and so stupid that you think that this is a reason that those laws shouldn't apply to you? Its a fundamental point of law that ignorance is no defense in ALL countries.
I can guarantee that there are hundreds of laws you have never heard of that the UK police can hit you with and, no, they are not in an easy to find list clearly stating the law.
If you don't like the American approach to law enforcement, don't go there. I don't.