I understand your sympathy towards your friend but being in an accident with mulitple injuries and being bed-ridden doesnt give him the right to trash your shit. Being hurt doesnt give him the excuse to be an idiot. Just because he isnt 100% physically, he doesnt have the right to disrespect your property. I would chew his ass out, regardless of his physical condition and as soon as he was able to work...i would make him pay for it.
How would he feel if he dropped serious change on a vehicle and you f-cked it up????