I'm wondering how the OP knows who is getting banned for what. We do not share that info. Usually, if someone posts something that warrants a ban it gets deleted, and even if it doesn't, there are no indicators that show someone got infracted for making it.
The only person other than site staff that would know is the one who got banned. And in my experience, these folks can't be relied upon to tell the whole truth. So perhaps they get banned & its seemingly for one little comment they made. However, what they fail to mention is the previous infractions they've received for that same behaviour or the PMs that mods have sent them telling them to knock it off or even the public reminders that the staff make, reminding people to tone it down or risk infractions. And all that is assuming that they're even telling a partial truth. Its pretty easy to say 'they banned me for nothing' when in reality, it would be self evident to practically anyone else why they were banned.
Now that thats out of the way, if you see something that you think we should act upon report it (

),imple as that. We will review the post, and act accordingly. This might be a deletion of the post, banning the member, making a public warning, sending a private message, issuing a warning, making a note to watch their behaviour, or doing nothing at all. Just keep in mind that even if you don't see any action taken doesn't mean we haven't done anything.