"& that everyone should desist immediately is not a considered response either. "

I don't think I've said anywhere that anyone should desist anything immediately, I've merely pointed out that some people may well be offended by blacking up.

Of course it is impossible not to offend everyone all of the time. Let's face it some people need offending....... I just think that you should always try and be aware of the impact you are creating.

If that impact is what you inteded, just go ahead and do it, if not, maybe you should think again.