History is to be Learned From

Normally I don't buy into most hand-wringing blathering about "National Security", and I'm even guilty of putting some personal freedoms ahead of security concerns ( I hate taking my shoes off at the airport). But, the recent gas truck explosion in the San Francisco Bay area concerns me.
One day, while we were sitting around thinking about what terrorists might do next, I considered the simplicity of hijacking a fuel truck. A determined suicide bomber could detonate one of those babies under the 4-level interchange in L.A. and virtually cripple the city. Set it off during rush hour and many deaths and much terror would ensue. If a terrorist were to open the valves before detonation, what could one tanker truck do to the Golden Gate Bridge? Talk about a visual for the television news, it would be right up there with the World Trade Center coming down.
If this seems far fetched, consider that 1996 was the worst year in history for plane crashes, and many news stories described how the wings of passenger jets were loaded with fuel before take off, some articles describing them as "flying bombs". All of the 9/11/2001 hijackers started flight training in 1997-2000. We aren't dealing with a bunch of dummies here and I hope the FBI is keeping an eye on tanker trucks for the next few months.