I don’t believe in lane splitting. It leads to too much variance in speeds between vehicles. Its not the actual speed that is dangerous, its the variance in speeds that is dangerous.
I think the chances of rear end collisions is less than collisions caused by lane splitting. I’ll go with the flow and get there when I get there like everyone else.
I have to respectfully disagree with your first statement. You state it as an absolute, but it isn't. A motorcyclist can choose to create too much variance in speeds between vehicles just like a car can on a flowing freeway. Or, the motorcyclist can chose pass the cars in a safe manner. This is no different than if you are riding down a multi-lane road and the cars in the right lane slow for someone turning right into a parking lot. If you ride by at the speed limit, you are in greater risk than if you slow down to decrease your variance in speed. I have had several times where the car wanting to turn right into the parking lot is partially blocked by someone wanting to turn left out of the parking lot, and the idiot signals for them to pull out with no knowledge of someone coming down the left lane. Then the idiot in the parking lot takes the word of the idiot in the car because he can't see the traffic, and pulls out.
Personally, when I rode in California, I was there to enjoy roads, and not freeways, but I did have to ride through some towns where I definitely filtered to the front of the stopped cars at traffic lights. I wish that was legal in all states with a white stop line for cars, and a line ahead for bikes.