Any government practice that might facilitate the abuse of power should not be undertaken except in cases in which there is a compelling reason to do so.
Statements
conditional - ANY / EXCEPT might facilitate abuse of power and → shouldn't do it no compelling reason to do it
fact Keeping govt secrets is a practice that might facilitate abuse of power.
(infer-as-we-go: We shouldn't keep govt secrets if there's no compelling reason to do so.)
fact Govt officials are sometimes justified in keeping secrets
(infer-as-we-go: sometimes they have compelling reasons)
fact Too often they keep secrets for insubstantial reasons and enable abuses of power. (infer-as-we-go: they should not have done hat)
conditional - WHEN
Govt officials conceal this practice opens the fact that they are → up opportunity keeping a secret for more abuse
Evaluate
The paragraph ends talking about a practice that "opens up an opportunity for abuse". The paragraph began by talking about a practice that "might facilitate the abuse of power".
So it seems like we could say that government officials should not undertake the practice of concealing from the public that they are keeping a secret, unless there's a compelling reason to do so.
Goal
There are so many facts here that I wouldn't try to 'solve' it upfront, since it could go a lot of different directions. We know we have a very useful conditional in the first sentence. It potentially can be applied to some of the actions we then were told about, and maybe it could even be applied to the rule in the final sentence.