Straw man argument. The two activities are not mutually exclusive.
I could just as easily turn it around and say, "So, ignore wrongdoing by cops so we can spend all our energy fighting corrupt politicians?" How much sense does that make? None.
And, BTW, I do NOT hate cops. I know a bunch of them because I am a first responder myself (not a cop, however). Most are decent and honest, but a very sizable fraction fall short of what is acceptable, and the rest cover up for them.
With power comes responsibility, and cops have power--a lot of power--because they are the citizen's first contact with the justice system. Cops make the initial decision to arrest or let go. Once in the criminal justice system, a citizen is punished whether he is found guilty or not. He is out time, money, and perhaps his freedom for a time even if the charges are eventually dropped or he is found not guilty.
The more power one has, the higher should be the standard to which they are held.
It is wasted strategy in these times to chase the symptom instead of the cause.
Casing the symptom joins you to, and leads you to do the work of