One just needs the means to do so!
Dallas PD chief is highly political, in a city dominated by Dems on the council. The PD lowered the crime rate by reclassifying certain crimes as ticketing misdemeanors so they would not be reported and the police would not have to respond.
His actual response would be, we want the schools to continue to hire off-duty officers to keep the rank and file happy since thy hate my guts.