The story didn't really do a great job of showing this, but going around proclaiming that you are the only one who can protect your people while simultaneously promising easy fixes for all of society's problems is pretty much how every totalitarian despot in history rose to power. The problem is that the world is much more complicated than that, and just using extreme violence and coercion to cow everyone into submission always ends up causing more problems than it fixes. Even in the world of comics where simplistic solutions are made to work through leaps of logic, most of what Scott was doing made no sense, for example one does not simply "seal" tectonic fault lines and doing so would certainly be disastrous. The idea that Cyclops, the guy with perhaps the most damaged psyche in all of comics, would be the one person that could exercise absolute power wisely and responsibly is a bit hard to believe.