Your adverb.
. . . we don't have decayed bridges and highways just because Bush cut Federal income taxes a few years ago.
(emphasis mine)
Of course the roads are old, of course they have increased stress on them because of more traffic and more congestion.
Yet it's plain that the rate of repair has stagnated since the money to make the repairs has been, um, reallocated to the private sector under Bush.
Are we just talking interstate highways then?
The Federal government is responsible for the lion's share of the upkeep on these very important road systems. They have not been keeping up, because the money isn't there to make the repairs. Upon these roads hinge economic well-being, national security, and personal safety.
"Just"? Isn't that enough?