explain the reasons why governments establish and operate crown corporations?

Answer 1

usually it is because problems come up, or decisions have to be made that polititions don't want to take the heat over.
so they make a crown corporation, that is controlled under the table by gov't, but gov't can deny responsibility for unpopular decisions.

Also, by making some crown corporations they can take the financial parts of the corporations of the governments books, so debt that once was on the governments books is now on the corporations books....just accounting slight of hand.