“They could get their fire teams out to the areas where they saw flares possibly going into neigborhoods or work with local fire departments.”
You aren’t in Southern California are you ?
No, but I didn’t think I also had to address arson along with anti-SAM systems! But even so, a missile blinded by a laser still has to fall to the ground and/or hit something and possibly explode and start a fire. Either system you are risking a fire on the ground somewhere, either by the flare, or by the missile itself.