Full Auto bursts give mundanes a shot at hitting spirits by penalizing those dice pools. But as mentioned, doing anything once you score a hit is problematic. Well... WAS problematic before blight. Now: all you need to do is hit. Unless the spirit can soak 12 drain, it's just gone. Granted, really high force spirits might pull it off if the mage spends some edge...
With DMSO+blight capsule rounds and an appropriate weapon and ammo supply, you can even just lay down suppressive fire. Spirits almost assuredly won't bother ducking for cover, knowing their immunity to normal weapons will let them shrug off single plinks. But in this case, one hit=one spirit kill.
Of course, the Paul Blart NPCs will likely have neither full auto nor blight toxin rounds, but it'd be malpractice for fast response/high threat response NPCs to show up without them.