I will respond to this now. I do understand where you are positioned on this Darren. As has been seen this morning, we banned someone for this very issue. They were hiding behind an anonymous name, and free online email address, for purposes that we are not sure of, but we believe they were here to bait others for their own reasons.
It is really a balancing act, between making the site accessible for people to join up to, and being aware that some are here for purposes outside of what the site is for. I know that we can never make it completely 100% safe and free from these trolls, but we do what we can. I doubt any tightening of the joining conditions will see us ever stop them if they are determined to join. So all we can do is be alert for them, and act when we become aware that all may not be what it seems.
If we got to the point that trolls were becoming a regular issue, then obviously we would need to look at tightening up our joining rules. For now I think we do quite well as we only get one of these every so often. Unlike some sites (mostly non photography) where trolls rule on a daily basis.