In an ideal world we would be able to spot these misfits, we neither live in an ideal world nor do we have enough knowledge of the human mind nor the capabilities to fathom the criminally insane,

Which is why we should try to gain that knowledge so we can benefit from it.

no amount of study & understanding will prevent other like minded people from achieving their goal!!

Why not? If no attempt is made, it can be guaranteed it won't be prevented in the future.