Are we devolving by having emotions? ?

So I was thinking, and found that our soul purpose of being on this planet, is to be the protectors of it. We are here to make sure everything is in order. Because other animals don't have the intellect that us humans do. So are we devolving by having emotions? That all they do is stop us from doing what other animals do, kill off the weak and worthless. And make sure that our race survives. But all it seems is that we are ruining where we live by over populating, and using the minerals that the earth makes for the wrong reasons. Everyone is at war, because of hate, which again. Is an emotion that only seems to ruin things. Do you guys feel that emotions are better, or only making things worse?