Even if they do learn "rm -rf /" they will get a premission denied,
unless
you gave them your root password(which way would they need it??). If you have a strong security policy on your bios and within Linux, it would be a challenge for your kids to wreck the system (hint disable boot from floppy on password protect bios and only let root mount drives). Unless your kids take the machine apart and swap the hard drive into another machine (hint encrypted fs) they would be pressed to find a way to screw it up.
Just make sure that they dont know where the cmos battery is. Unplug the batt and plug it back in .... bye bye password protection.
If you are really concerned that your kids are out to destory you system, you can get those steal lock rack mount cases, those things are like safes, in fact you could even create a custom case from a safe. Just hope they don't find the blow torch in the garage... :) You could also put a drop of hot glue on the cmos battery, sure they could still get it out, but you would be able to tell that it was removed. Also video cams all around the house. DOD Red Book 2, B1 security for your kids :)
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