Violence is often the solution, but it shouldn't be the first solution we try.
It's stupid to assert that law enforcement should be completely unarmed. There's absolutely legitimate situations where it's in the public's best interest. Now, the situations that do require it aren't super common, but they exist.
In the US at least, law enforcement is overarmed. We'd cut back on a lot of unnecessary violence if, say, officers kept their guns in the trunk rather than on their hip.
That works a lot better in countries where everyone and their mom doesn't have a gun. Though good god we don't train cops enough to justify giving them a gun
Violence is always the solution. If there's an example for major changes implemented without at least an implicit threat of violence, that's the absolute exception. All big changes always require (the threat of) violence.