Happiness?

Recently read some distressing news about another school shooting in US. I've always wondered why is it that so many such incidents happen in US. While school shootings are mercifully less in other affluent countries but they have their own set of behaviour problems.
Now while many will be quick to blame western decandance and lack of moral values etc, I consider that pure drivel. US/Europe is as moral as India or anywhere else. Its just that morality is a very societal concept and definition must vary.
Poor countries have their own problems of violence in life but what got me wondering was why should rich countries with all their investments in education, personal attention to each individuals, social security and all, should have so many senseless crimes?
Now basically I am a restless guy jumping from 1 thing to another. Another chain of thought was how does social security improves one quality of life and society in general. For one, it allows one to follow the heart and do things that makes one happy rather than do what will ensure a steady trickle of silver. This has obvious benefits. When people do what they enjoy doing, they tend to do it well. And this may explain why so much of western art and social thoughts are path breaking.
One the other hand, I think it also gets in the way of evolution. In jungle if a tiger decides to loll all day in green grass smoking pipes and thinking of what ills has the society inflicted on it, it will starve and the deers shall all be happier for it. So maybe by removing the fear of starving, it allows the social misfits to become a drag on society.
So these folks will happy live of the social security and not bother with any productive work.
I am not saying that social security is bad, what I Am saying though, is that a system that allows a person not to try and do any productive work and yet live a decent life will be abused. Remember the general human trait is that if there is a potential for abuse, people will start abusing it.
So you have this case of someone living in car, having handguns and all, I assume not working- still managing to afford all these, having wild fancies on some kind, walking into people and killing. In a poor society, such a guy would either have starved and thus removed the danger to society or else would have been too busy scraping togather a living to do any real harm. There is a certain misnotion in most of the western world that we humans have some God given inherent right to have a good life. Why should human have a good life which is not earned by them?