Not sure what you are talking about with regard to reg numbers, the point you should remember is, this is a public website and not everyone likes to see their reg number displayed so they are either removed by the original poster after a request from a owner or the mods will change at the request of the owner - it's good policy not to post reg numbers any way, you don't want your number being used elsewhere, plus if something happens to your car - say an accident, you don't always want other people to see that.
As for your other point "freedom of speech" - no problem, but at least do something about your situation and report back instead of just going on and on. Don't forget I'm not just a moderator I'm also an owner and therefore I to have the right to say my piece - just like you.
You will be surprized just how many people love to come on these websites, cause trouble and have not even got a car.
I trust that answer your question - I like to think this is a friendly site, the rules are pretty simple as long as people play nicely the need for moderation will not be required.
I forgot to add, normally if in mod mode I would leave a tracer or make a comment in red, so if it's black I'm not moderating
Rob.