An opinion you're not alone in. Metal Gear Solid has some excellent soliloquies on why nuclear weapons are different from conventional weapons; where other, more conventional weapons can be anti-armor or anti-installation, a weapon of mass destruction is, essentially, an anti-civilian weapon. It is made to fulfill the last resort of blitzkrieg (the standard of war which most countries have fought since WWII), which is, if bombing the factories isn't working, bombing the workers who staff them. This does so on a grand scale.
A nuclear weapon unquestionably, at least in an earth-bound setting, is an anti-civilian weapon, and a nasty one at that. Nobody should have them, much agreed.