Why do some people state that rules are meant to be broken but are appalled when the law is?

I find that, with many of those type of sayings, people throw them about because they sound catchy - but if you put them into practice without thinking, they're usually very unpractical.

Someone l once told me I should "Act first and ask questions later" when I asked for advice about a certain situation.

If I actually took his advice and lived my life doing what I wanted and then worrying about the consequences later, I'd probably find myself in a heap of trouble pretty quickly.