Defund it entirely, along with the ATF, NSA, CIA, and maybe the FBI.
But keep Homeland Security?
No, they should go too.
Keep some. FEMA, Coast Guard, and the Secret Service are good ideas. (They don't overthrow governments, spy on everyone, siege civilians, nor habitually seize things without warrants.) Some kind of border protection is necessary for a functioning state, but all those agencies seem staffed with sociopaths on power trips.
They all share extremely limited scope, which is helpful.
Making sure forfeited assets don’t end up in the coffers of the institute that takes them would be a start to disincentivize this kind of theft.