Are they limiting their raids to be within 'blue' states / districts to minimise the collateral damage their reputation may receive from those sympathetic to this cause? Chicago was 77% Democrat in the last election. These behaviours won't stop if there's no blowback from the MAGA base.
It’s also about scaring the liberals into compliance.
With liberals, deploying the military to their cities is about instigating actual violence, so they can imprison and kill them.