The Junior doctors were a bit of an exception to the rule but absolutely, I think the politicians rely on the fact that most of us can't afford to get into trouble with the law because it can be career-limiting.Problem is peaceful protest doesn't achieve much unless you can put the pressure on - most people have jobs, lives, etc. they can't spend days on end piling the pressure on and the ruling classes rarely respond to anything other than being under sustained pressure.
Violence unfortunately can achieve the same result in much less time.
Some of us can't even fart without getting prior approval. Never mind turning up outside Westminster with pitchforks and molotovs. :/