Juicetin is right. If someone pushes your car into another then that act is beyond your control.
Looks like the guy that hit me was screwed over by either mine or his insurance companies or maybe it was both of them.
It took them 7 weeks to fix my car and in that time I had a 62 reg Range Rover Sport. When I got the car back the list of stuff they replaced was down right disgusting. They replaced all 5 seatbelts even though I was the only one in the car amongst other things like a front wheel and tyre that had a tiny bit of kerbing on it.
Total ripoff merchants the lot of them.
would you rather they tried a cheap re-furb on the wheel instead and never replaced the tyre 
I would rather they fix what was damaged in the accident rather than replace things like wheel that I damaged myself months before the accident. It is a view like your that has the rest of us paying so much for our insurance.
I would rather they fix too much than too little, or be phoning me up every 5 mins to ask me the pre-crash condition of a catalogue of parts that they would otherwise assume were untouched. In the grand scheme of things, that wheel and tyre were probably small potatoes next to the whole cost of the repairs.
Perhaps the seatbelts were all replaced because the pretensioners all went off and the seatbelt units include pretensioners as bought in. So much throwaway tech now, and when that tech is safety tech, i'd be glad they replaced them just in case.