If the government tells you that you can't play loud music after 10pm and you do it anyway, eventually someone will issue you a citation. If you refuse to pay that, eventually you'll get a court summons. If you fail to appear, eventually a police officer may arrest you. If you resist, they will use force to make you comply.
It's a bit hyperbolic, but it is a standard libertarian/objectivist "gotcha".
Imagine a town council meeting where someone is proposing a $25 fine for crapping on the sidewalk. And a libertarian pops and screaming "You're saying you want to use violence up to and including murder to keep our sidewalks clean!"
Again technically there is a hypothetical chain of causality from sidewalk crapping fine to bodily harm/murder, but no one other than another hardcore libertarian is going to be convinced by that argument.
Generally libertarians only allow for rules against behaviors that violate the rights of others because of this, and I think that's about right.
Because that's what you _are_ saying. Laws are enforced by the police, and they are able to be enforced by the police because the police are legally able to use force. I do not understand what other view there is to take on the issue. In my mind, it's not an opinion, it's a fact.
The fact that people “don’t agree” means they’re morons. It is fact.