As mentioned, the game is designed to be co-op with friends type of game and will never turn into a "RUST" style game.

It would be a freaking miracle if you were to even find any sort of "open" server where you could just join as a random. IF you were to even find such a server, you wouldn't be able to simply walk in and start killing people since, by default, friendly fire / pvp combat are not activated and can only be activated by each person individually, if they choose to participate in PVP.

Most every server is locked because there are no good ways to prevent some random from breaking / stealing your stuff... someone mentioned the ward, but that thing is a joke and will not prevent theft... it would only slow someone down slightly.... Even if the player who owned the place was there, he / she would not be able to prevent the damage caused or harm the would-be robber.

Even worse is the ability to use console commands to summon mobs of any level, and any amount... essentially someone could potentially cause servers to crash by summoning in so much stuff at the same time, etc... THIS is why people don't open up their games to let random people join, and why this game will never become "RUST"