You stole a bed among other blocks to get into their home and area.
There are signs at the spawn of the server telling you to read the rules and not to grief. There are server adverts almost every 5-15 minutes that remind you to read the /rules. In the real world, breaking into someones house is a crime, why would it not be on this server?
The ban is only three days, so I would like for it to stand. Just because your new does not pardon you of ignorance for not reading.
We wish to see you back, and when you return, I hope you keep in mind what is and isn't allowed.