Earlier quoted context omitted.
Yes let us just start collective punishment, because we have such a justice boner. Jesus christ, sometimes HN has some wild opinions. Just to be absolutely clear -- it's not reasonable, and what you're suggesting is literally how North Korea handles crime. "Oh but you know here it's different" -- you're setting a precedent which, if allowed, would mean your family members could face jail time for crimes YOU commit.
No-one is talking about putting people in jail, but also (in my opinion), someone shouldn't get to inherit millions of dollars just because their grandfather committed some terrible crime -- inheritance should not be a right, when the original money was acquired illegally.
Every law, no matter how small and well-meaning, has implicit threat of prison behind it. You can't be so naïve as to believe that this enforcement action won't result in prison for some, destroyed lives for others, and because laws and enforcement are man-made, there's also a guarantee that your dragnet will punish some innocents, and let some guilty go (maybe because they can afford great lawyers and/or bribes). And of course, because this would be a very controversial measure, it would be highly politicized.