Because the temptation to use the powers would be so big that you would need an incredibly powerful will to resist it. Just a few bad days and a few fights and you'd end up hurting people left and right and then authorities would try to catch you, so you'll end up having to use your powers to defend yourself. Then they will send the military and when that fails, countries would join forces to hunt you down. It would all go downhill really fast and you'll more or less voluntarily end up destroying the world.Well I think this is a win-no lose scenario. Pressing the button can only be good for you. If you want to do negative things, you can. And if you want to do negative things, you're basically a living god. But if you don't want too, well you just live your life normally. It basically means you can have whatever you want, whenever you want, if you choose that option. But if you choose to be normal still, it's fine. There's really no reason not to press it.
Assuming that there is life on other planets...I would leave earth and do my evilness elsewhere on another planet so that I don't have to worry about hurting anyone on my home planet.