I imagine it's like any other enforcement agency: some mods are sincerely motivated by a desire to create a civilized environment for intelligent discussion. Others simply enjoy the ability to ruin other people's day. These two things are not necessarily mutually exclusive. In any case, there's some degree of luck involved as to who checks your post, just like when you get pulled over.
I've managed to avoid infractions so far simply by trying to avoid my hot-button issues and only posting when I feel like I have something worth saying that hasn't been said (or at least phrased in the same way) already. While it does occasionally occur to me that "Huh, there seem to be an awful lot of suspensions and bans around", I then remember that if the same rules were suddenly applied to say, Youtube, something like 90% of the community would be banned within the week (if we're having a particularly intelligent and civil Youtube week)
I've managed to avoid infractions so far simply by trying to avoid my hot-button issues and only posting when I feel like I have something worth saying that hasn't been said (or at least phrased in the same way) already. While it does occasionally occur to me that "Huh, there seem to be an awful lot of suspensions and bans around", I then remember that if the same rules were suddenly applied to say, Youtube, something like 90% of the community would be banned within the week (if we're having a particularly intelligent and civil Youtube week)