Religion may be a contributing factor, but not totally to blame. We still have our instinct to contribute to the prosperity of our species. With the world as it is now, it only makes sense that the desire to keep ourselves alive dwindles in anyone who feels like they serve no purpose, or that the world is in no condition to live in.
We subconsciously know that there are too man of us here destroying our only home (for now). Our children would only struggle to meet the bare minimum to survive, much less have a decent life. This is what drives people to self-destruction. We aren't being lazy, we've simply accepted our inevitable demise as a species.
