From the thread title I expected graphic mating photos.
Ha, ditto there.
I think that pointing out potentially harmful situations to people is never a bad thing as long as you're diplomatic about it. I'll admit that Troggy gets some exploration time in my living room. I am taking a calculated risk. If someone saw a photo of him on my floor with a sleeping giant dog in the background and cautioned me about the potential dangers, I'd agree that there are safer situations for him, but I'm open to criticism as long as it's constructive.
As a relative noob, I'd be hesitant to give the same sort of advice to others unless I really felt I could back up my statements, but again, if I could, I'd be certain to be pretty laid-back and non-threatening about it. My job is actually advising people on animal (specifically, cat) care, so I'm pretty good at doing so in a non-judge mental way.