Thats how it is here now, cuz police used to do the same mostly stopping speeding mopeds.
But its not a matter of the police getting sued, its a matter of Danish society getting more and more spineless, so now a tool like this to stop a crook are considered totally out of the question.
Personally i think the trend should go the other way, there are plenty of people and bad people / crooks in the world to bother just a little bit about their well being, so i would welcome more radical means against such people, and that in turn i am sure would have a effect where as weak ass sentences / fines / jail are proven to not be working.
Danish police even openly admit that though the fines for several traffic offenses like talking on phone and not wearing seat belt was tripled some years ago, there are no numbers that indicate this have made Danes stop do it.
BUT ! i am pretty sure if you get caught talking on the phone and your car are impounded in 6 months, you will not be doing that again, not least cuz if you did your car would get impounded and sold and you will not ever be allowed to drive a car again,,,,,,,, that i am sure will work pretty good.
But the people we Danes vote for are spineless idiots, so that simple fix will never get implemented.