Personally, I find it difficult to talk about the bridge without posting a picture. So, here's a pic:
Recently, Putin stated that Russia's attacks on Ukrainian infrastructure will continue as Ukraine started it by attacking the Kerch Bridge.
I now have revised my theory on the Kerch Bridge attack.
What Russia was doing in Ukraine was not working. They needed to change overall strategy. Russian military planners wanted to start attacking Ukrainian infrastructure.
Putin agreed, but wanted an excuse to start the attacks.
Putin needed a significant and believable Ukrainian attack on Mother Russia's infrastructure.
So, a truck bomb on the bridge would be the false flag event that would allow Russia to retaliate and attack civilian targets.
The explosion had to be big enough to be believed. An explosion on top of the road bed should not cause much damage. Or that is what Russian planners thought.
What they didn't consider is the crappy construction of the bridge. And who would have thought that a train, with fuel cars, would be parked on the rail bridge at exactly the wrong place.
The scenario that Russia came up with is simply not believable.
That's my story and I am sticking to it.