A car is easily converted to a bomb.
Though the latest explosive ordnance tech may trace an innovation curve toward tiny/powerful similar to that of the smartphone, for the purposes of terrorism, a few sacks of the right garden-variety chemicals packed in a vehicle is all it takes to cause mass destruction and appalling casualties. A car bomber doesn't even necessarily need to die behind the wheel to detonate it. He or she can live to attack again.
That was certainly Timothy McVeigh's thinking on Apr. 19, 1995, when he lit timed fuses to a massive homemade explosive device in the yellow Ryder truck he'd parked in front of the Alfred P. Murrah Federal Building in Oklahoma City. The ensuing detonation, registered by seismometers at the nearby Omniplex Science Museum at approximately 3.0 on the Richter scale, destroyed one third of the building, killed 168 people (including 19 children) and wounded over 680 others.
McVeigh's truck bombing was, to date, the deadliest act of domestic terror in U.S. history. It was the deadliest terror attack on U.S. soil prior to the September 11th attacks, which would eclipse the memory of McVeigh's villainy just three months after he was executed by lethal injection on June 11th, 2001.
Terrible as it was, the Oklahoma City bombing paled in comparison to the strength and lethality of the 1983 car bombing of the U.S. Marine barracks at Beirut International Airport. In that attack, a suicide bomber drove a truck packed with over 2,000 lbs. of explosives directly into the heart of the facility.
The blast, which FBI investigators later qualified as the largest non-nuclear detonation since WW2, killed 220 Marines, 18 sailors, and 3 soldiers. Estimated to have delivered an explosive force equivalent to 21,000 pounds of TNT, it was the largest car bomb ever detonated. Eyewitnesses reported seeing the building levitate off its support columns on a cloud of concussive fire before thundering down into a plinth of stratified rubble.
The 1st Battalion 8th Marines stationed there was part of a multinational peacekeeping force supervising the withdrawal of the Palestinian Liberation Organization from Beirut. Under the peacetime rules of engagement, security around the barracks was relatively light, with sentry's weapons unloaded and on safe. However, given the size of the explosive device, investigators concluded that the barracks would have been destroyed even if the bomber had been stopped at the last checkpoint and detonated it there.
Converting cars into mass-casualty weapons has been repeatedly demonstrated as an effective, go-to tactic for insurgent forces and terror organizations. It works to create chaos and inflict collateral damage and serves to erode the momentum of the mission wherever the U.S. deploys its armed forces.
But the sowing of terror has as much to do with the conversion aspect as the deaths that result from the bombs. The psychological shock of a terrorist act is heightened in the imaginations of those left alive by the awareness that a common token of peaceful, everyday life — a yellow box truck, a commercial jet, some dude's underwear — has been turned, by fanatical human creativity, into a weapon of mass destruction. It's a move tailor-made to mess with the mind of comfortable society. And even though it's been happening with increasing frequency since the turn of the 20th century, the shock of the vehicle bomb never seems blunted or dulled, and the dread of it, never fully absorbed.
We can't get used to the horror of it. To the moral mind, it smacks of such desperation and depravity, we won't allow it to become normal. And in that, there's some small hope to be had.