Modern fire trucks, and police cars usually, are built to be able to push vehicles out of the way. It's a very common need.

(Not an argument against Waymo doing better in this situation though!)

if google's property is blocking the road, google can pay for the damage

If we reach the point of needing to forcicbly move mass numbers of cars off the road for fire trucks, that's a dire situation where routine cost/benefit analysis has already gone out the window.

They have massive steel bumpers, pushing them away slowly seems mostly harmless (not at maximum velocity lol)

True, but in a 'Big One' event i dont think we would care.