I'm sure you'll also find that lawyers make statements in favour of hopelessly guilty murderers. That's what they are paid to do. Your "freedom of expression" does not include hitting people with sledgehammers and attacking and disabling national defence infrastructure. Of course, we should withdraw from the HRA precisely because it is perverted in this way by lawyers, but those bald statements do not in fact show that hitting people with sledgehammers is legitimate freedom of expression or protest, and it appears that committing such acts is the principle reason for PA to exist.