I would welcome a government that did absolutely nothing except stop bad guys from getting into power. Unfortunately, Congress thinks its job is to pass "legislation" and it does so in vast quantities. This has piled up over the decades covering the entire country in a gray legislative goo. If abolishing Congress is too big of step, how about changing the rules so that any new law requires a 70% majority? Or maybe even a 90% majority?

I'd also note that democracy is altogether a failure at preventing the worst people from getting into power. Some of histories worst tyrants from history have come to power through party politics.