> (2) freezing an asset like impounding/towing a car away and the owner can eventually get the car back later (e.g. after Russia stops the war) ?

At least in Europe AFAIK. The rationale is to prevent, at least temporarily, oligarchs from benefiting from their assets. And the possibility of getting them back could give these influencial oligarchs an incentive to push for a resolution of the war that might be less catastrophic than where it is headed now.