"Can't" and "Shouldn't" should never be confused for one another.

Also known as "people do all kinds of crazy shit when consequences aren't a thing". Basically why Mortal Kombat was, and still is, a big hit: since it offers extreme gore and violence without the consequences of actual gore and violence.

I believe Aiden Tozer put it best with a religious turn:

In short, fear of consequences mean more than morals for most people, although many are also in denial about it. The former is not a social construct, after all.