You will of course come up with many arguments, virtually all of which I'll agree with, that asset forfeiture is "unreasonable". The problem is that other people disagree with you, and, specifically and distinctively with this particular item in the bill of rights, the court is supposed to defer to the legislature as much as it can.
It seems pretty cut and dried to me that the 4th amendment supersedes any law passed in direct opposition, just like the 1st or 2nd would. This isn't a case where the courts would be making multiple logical leaps to invalidate a law they disagree with, you can describe it in 4 words "seizure without a trial", then look at the 4th amendemnt.
Having said that, the history of 4A law suggests that the word "reasonable" in 4A connotes a mandate for unusual deference to the legislature --- and SCOTUS already tends strongly towards deference.
But the only way they will do that again is if there is public pressure. So even if a lot of people disagree with me, the proper course of action is not to shut up and take my medicine. The proper course is to keep raising hell about it.