And now think about other countries conducting drone strikes on US soil as they see fit.
It would be only fair, right?
And what level of collateral damage would be acceptable in that scenario?
2000-3000 would be OK?
Maybe 10000-20000 since those other countries can't afford precision munitions and global surveillance network.
It's easy to justify any number of collateral damage when it's not you and yours that is the collateral damage.