List of potential culprits:
1) Government agency (or private contractors) looking to justify more spending on infrastructure security.
2) Whoever gets paid big bucks to fix the damage. I would be shocked, shocked to discover that unionized emergency repair crews would damage stuff so they could fix it.
3) Occupy Wall Street-type anarchist yutes (aged 15 to 60) expressing themselves by destroying the corporatist structures of capitalist enslavement, or something.
4) Illegal aliens, ISIS, Al Qaeda, China.
5) Rebel-yellin’, Confederate flag wavin’ ex-military white male conservative Christian Tea Party sovereign citizen haters.
1 through 4 are racist and offensive. Gubmint must investigate option 5 only.