They were sent into the unknown with virtually no right of return. They survived and created their own Clan. There is land, there is respect from others. But if something is forbidden to you, it becomes very important. Bypass the ban, achieve success where others are unable. There is an opportunity to bypass the rules - move forward without looking back at the consequences. But the Clan is not going to exist according to laws, earthly or elven. He has his own. Taking everything you can is right and useful. If you can’t do it any other way, pay; if you can’t, rob. After all, they came to Earth illegally and are simply forced to behave this way and not otherwise.