Obviously you've never had to drive through Wilmington to get to Long Beach.
Oh but I have. Sorry to say I own two properties in Wilmington, and drive over that bridge 2 to 3 times a week. My wife uses it daily to get to Long Beach.
Although I personally would be greatly inconvenienced, I do not live where the majority of people live and that is north of the bridge.
Even if the above was not a reality, it's not as convenient not having the bridge, but that is nothing like what would happen if you took out one of the bridges in SF/Oakland. The real damage, if the LA bridge was targeted, would be to block commerce in the container traffic.