When I first started minecraft, I didn't read a single thing, no rules, nothing.
This was on a survival server, I got banned not knowing what I did, don't even know how to talk to someone about it just because I couldn't get used to minecraft having a chat system (I was playing on Minecraft PE)
So not everyone would read, or just really really blind (or they couldn't understand) a tempban really helps open the eyes of these kind of people.
Some are sorry some don't care. We want to help the portion who are truly sorry and regretted their action.
For those who don't care and got a second chance then got punished again, you mostly won't see them because we judged them on what they say and the offence + past offence/warnings.
So yeah, not everyone who appeal, cares. Just testing luck.
It isn't hard to warn someone so I think the rules are good as it is.