Then keep on allowing EVERYONE in tribe the ability to dismantle.
Seriously, if you don't make an option for this VERY SOON...the first great heist will cause many from that tribe to quit.
How hard is it to apply for a tribe, get a good reputation with said tribe, wait until they build everything up. 6 months down the road, they literally can dismantle every building in the tribe in less than 15 minutes.
How can this honestly not be an option under ranks?????? You better fix this before this happens to tribes of 50+ members and you lose out on 750 dollars a month.