The problem with evolution is that random mutations will cause both good and bad traits. In some cases, it's difficult to know which camp it fits in. Survival of the fittest is the mechanism nature created to deal with this by removing the bad traits using a combination of methods, including killing idiots or at least maiming them to make them easy prey to other creatures. Unfortunately, in todays health and safety conscious world, we've implemented many methods and rules to remove natural selection, which results in the bad genes being allowed to multiply. We're actually dumbing down the human race here folks. People should never be prevented from killing themselves due to their own stupidity, as this is exactly what nature intended.
It's incredible how on certain occasions, nature is held up as being the best way and nature is always right etc., but on other occasions (such as this), nature is held to be wrong and we must keep these morons alive!!