I don't really get this attitude of because it can be done it's therefore ok. It's possible to kill people therefore it's ok. It's possible to loiter therefore

I don't really get this attitude of because it can be done it's therefore ok. It's possible to kill people therefore it's ok. It's possible to loiter therefore it's okay. It's possible to play your music at all hours of the day at 120db therefore its ok. It's possible to drive your motorcycle into a grocery store therefore it's okay. The physical world has plenty of laws and/or common sense/customs about what behavior is not okay even though it is fully possible. Why should the net be any different?