Beyond just "for fun", what is the benefit of having a fully-automatic weapon? I mean, I have a pulse, so obviously I suffer from "I can haz?" syndrome regarding these weapons, but I'm wondering what the real purpose is. For home defense? I would think semi-automatic would be preferable. Gives you more control over your rounds to leave enough in your magazine for BG #2, and gives you better shot placement. For police? Full auto seems to be a liability waiting to happen, especially for some departments (cough, NYC, cough). For military? I know we transitioned to burst fire on the M-16 to conserve ammo, but went back to full auto with the M4. What is the benefit over a semi-automatic?