Why must we wear a mask?

Wearing a mask is to protect you. Supposedly because masks work. So if you don't want to wear it and you want don't want to wear one and catch covid that's your right? right?. in public most people will wear it? what if you are outside? nobody will arrest you? Right.

The truth: it's symbolic for others? So in truth they demand you wear one for them because you supposedly can't pass It on to affect them. So its bull to say its for you because they attack you if your not wearing it,

now lat statement if you are both asymptomatic you can't spread it. That's what i've heard. Correct me if I'm wrong?

Also, children aren't spreading it to adults?