True enough, human societies do have a knack of doing this kind of thing, but most developed and civilised nations have learnt a few hard lessons. The kind of extreme self-mutilation of countries that seems to have pretty free licence in the USA isn't the norm.

Don't blame the genes and say "it's just human nature". Blame the political and economic system that encourages people to do this kind of thing to your country. (After all rape and murder are part of human nature - and, when you get down to it, this kind of thing is really just a variant of that part of human nature.)