Personally, I have no real beef with the po-po having armored trucks. There are plenty of legit uses for those.
For most departments, though, MRAPs are kind of a mess because of their unique servicing requirements. A Lenco BearCat, built on a heavy-duty Ford chassis, can be serviced at the county road maintenance yard, but Uncle Sam isn't handing those out on a free indefinite loan basis.
From what I can tell, a serious number of MRAPs loaned out to the constabulary wind up deadlined for lack of maintenance, and are therefore unavailable on a moments notice should we suddenly decide we need them back to go change a regime someplace.
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