I haven't read Atlas Shrugged, but I can point out a key difference based on your description.

By "statist assets", are you referring to assets that are claimed by the State as being their property? If so, then then such assets are clearly different from the privately owned assets of private individuals.

We're talking about Souter's private property here, not government property. His property is no different than your own, and the government has no right to coercively steal it. "Libertarians" who advocate the use of violence (i.e. government) to coercively steal property from an individual such as Souter are lowering themselves to the behavior of the freedom denying statists that they claim to oppose.

What's next... advocating the arrest and imprisonment of the Drug Czar's children if they are caught with some dope?

I do not think that being a libertarian requires adhering to the famous "non-aggression principle" (for an explanation of this, check out this column by Ali Massoud on the subject. However, I still oppose the use of government coercion to steal one's private property. My principles simply won't allow for the support of such actions.

If you think Souter needs such a come-uppance and have no problem with such seizure taking place, then why don't you gather up a bunch of like-minded people and carry out such an action yourselves instead of relying on the State to do so?