In general, civil forfeiture abuse is rampant and blooming in the US, especially given the financial incentive to perpetrate it and the lack of proper safeguards. That way of thinking you describe is
already open and that's exactly what happens if the police suspects you are not going to give them a good fight (i.e. is poor or alien or live far away or something of that nature) and/or the money or the property would be worth less to you than the cost of the fight, and they have chance to keep the money (in some jurisdictions, they do not). This
is exactly the way the law is interpreted right now. Just google the numerous cases of civil forfeiture abuse and despair.
However, in the case of SR they actually may have a pretty good case that those are money intended to buy drugs, etc. - it's not like SR ever hidden what they're selling and the buyers hid what they are buying, and looks like the law enforcement has these records. So since under the current law drug trade is a crime, and they would have absolutely no trouble proving the money is actually the drug money, in this case it is hard to classify this as abuse, at least without venturing into the whole topic of drug legalization and so on, which is beyond the point.