But to say that Government exists to promote outcomes that benefit everyone against individuals' self-interest is like saying that pit-mines exist because we enjoy creating giant pits. Or that cars exist so that we can burn a bunch of fuel. The restrictions on individuals' rights are necessary evils, which need to be carefully considered and minimized.
Hearing it framed the way you did does help me understand many peoples' points of view better though.
We accept bureaucracies because it helps us achieve common good that wouldn’t exist if everyone only looked out for themselves.
Roads and other infrastructure. Plumbing and water treatment. Sewers. Building codes. Schools for everyone. On and on and on these are things we’ve decided we’re better if everyone has access to or has to abide by, even if individually nobody would make it happen.
It’s in my self-interest to take everything you own and to dump my waste in the nearest available yard that isn’t mine. Nobody wants to live in a world where people act like that, so we collectively agree that things are better off for everyone if we respect one another’s property rights and pay someone to take our trash and sewage somewhere else to be dealt with.