If the driver is desperate enough, they'll just start ramming the police cars to get away.
While true, the method was not attempted (at least as presented to us). The most severe action was taken, before others were attempted. I did not see any reason to rule out slowing the driver down by congregation. The crusiers would have had no trouble overtaking the SUV if the driver was not combative. We saw no reason to believe that the method would have failed.
