Pretty much as Cornflakes said. I don't think they are actively encouraging evil or selfishness. It is simply a part of the game as it is in any game potentially.
Also I think you misunderstood the Law/Justice system. If that is enabled by the server host/admin then it isn't actually "magic fairy" anything. The only people who are able to react against you are those who witnessed the crime take place
If a player violates a law, they will be flagged as a criminal for that length of time, but that flag will be only visible to witnesses.
Personally I do not like being bad/evil in games for the sake of it. But I do know that a lot of people do. The problem I see with this is that personally as a gamer myself my view is this. I sink time into a game, I have fun doing ... whatever. If I sink say... 20 hours into something and some griefer comes along for no other purpose than to gain amusement from my suffering comes and destroys everything I have spent all that time building up... that to me is not fun. Yes I understand that it IS fun to a lot of people, furthermore the increasing malleability of games in the form of Minecraft/Terraria/Starbound/etc along with other games that simply flat out promote psychopathic tendencies such as EVE online have ultimately pushed non-psychopathic players into becoming that. "Attack them before they attack me" mentality. But this game unlike minecraft where many servers have anti-grief protection, and the ones that don't... provided people aren't using hacks/cheats you can take some steps to protect your creations by not doing it anywhere near where griefers are likely to be.
This game... Eco strikes me as a game that a lot of people are simply not going to be able to play it due to the fact that SOOOOOOOOOOOOOOOOOOOOOOOOOOOOO many gamers these days delight in nothing more than causing havoc and trying to ruin other peoples fun. It isn't even just gamers, it's just people on the internet in general. They feel as though they gain power by attacking other people in some shape or form, hiding behind the veil that is the internet. However if the Law system is NOT enabled then as far as I've read it will basically be a magical prevention that stops you from committing those crimes. But the laws that govern what you can/can't do whatever or not it is physically allowed (by server config) is ultimately decided by the people of the server. If you have a server where people cannot cooperate to build a decent society, it probably isn't likely to last very long and it won't be a very welcoming environment to those who do not wish to live amongst evil. And I hate even using the term evil. Malice perhaps, evil... not so much. Evil suggests a contrast to good. I don't like to break people down as good or evil. There are people who do things that have a positive impact on those around them and people who do things that have a negative impact on those around them. Sometimes the person might have semi-legitimate motivation for it. Other times their motivation isn't what I'd call legitimate. E.g Some people might be roleplaying an Evil character. Other people just do it because they're trying to piss as many people off or hurt as many people as possible to amuse themselves. I really expect that to happen a lot in this game, but I think it will likely die down a fair bit once people learn how to play the game and setup the appropriate structures to stop it from happening.
I can say this, I am likely to run my own server and I'll do my best to make an environment that is welcoming and helpful to those that wanna participate, and punishing to those who do not. My logic is if you don't wanna be a positive part of the community, gtfo. Yes mistakes will probably be made. Planets might be doomed. But as part of the challenge of the game I'm 100% okay with that. As long as it isn't some griefer whose only goal is to cause the destruction of other peoples effort.
It will be interesting either way.