The answer is yes, they can redress with some certain transactions, some of the mixing companies do some certain knowingly and some transact unknowingly too, but when government pressure come in they don't have a cogent reason to defend themselves.
What do you mean by "redress with some certain transactions", are you insinuating that mixers, which by the way are privacy tools should scrutinize addresses and transactions before deciding who they are going to allow to mix their coins in their platform, how are they then a privacy tool if they do that, that defeats the purpose of a mixer.
and secondly not all the mixing companies that government is after, they are after the ones they detected that they are into money laundering
The government is indirectly after the Bitcoin, they do not want anybody to be able to use Bitcoin privately. Very soon their agenda of "clean" and "dirty" Bitcoins would be so strong that Bitcoins fungibility would take a huge hit.
look at mixin, they are also a branch of mixers but government is not after them because they have no find any faults of money laundering with them.
Are you talking about "mixin network"? They are not a mixer if you do not know, but what they managed to do was lose over $200m of people's money because they kept the keys in the cloud.