I don't think I ever claimed to be "good".

That's a very fair complaint. I'll edit my previous post.

They are difficult to model and surprisingly volatile.

Feature. Not bug.

I suppose. Objectivists are less worrisome, but admittedly inferior company. And the rare few who by every appearance are as good for goodness sake as you could ask may not cause worry, but there's always something disquieting about them.