1) There is no rabies vaccine approved for use in squirrels.

2) Squirrels are not considered a rabies risk because they almost never carry it. It kills them very quickly - typically if they get it from a predator's bite they don't survive until they stage where they could be contagious. If bitten by a squirrel, you're not supposed to worry about rabies at all unless the animal appears to be extremely sick.

I wouldn't expect you to know those things, (I didn't, three days ago) but the people who made the decisions in this case certainly did.