Suppression forces won't fly into a private drone infested area at all.  They have no way of tracking them, they are fatal if hit with even a low speed aircraft and can easily take down any helicopter unfortunate enough to hit one.  Further, beyond the wreck and fatality considerations are the fact a crash would ignite yet another fire to contend with.  So no, drones are not OK in a fire zone, they can only lead to delays that magnify the issue.  California lost any chance on a recent fire of containing it due to private drone activity.