Filtering particulates in interior spaces is relatively easy, and when moving between them, you can wear a mask. Of course, this is very inconvenient, but it is so no matter whether the fire is a prescribed burn or a wildfire. Having to move elsewhere during prescribed burn might be highly inconvenient to you, but doing the same during wildfire will be highly inconvenient to other people. We might decide to favor some people over others, or balance the positive and negative externalities, but it seems silly to me to choose wildfires over prescribed burns just because the former are caused by inaction, and latter by action.