The Arizona Shooting: A Mathematical Guide

Let:

A = Matches and other inflammables

B = Children

C = Irresponsible parents

D = Semi-automatic weapons

E = Alienated young men with mental problems

F = Lax gun laws

G = Fatal house fires

H = Fatal shootings

Theorem:

A + B + C = G

D + E + F = H

Proof: Trivial

QED