Why sue for information that is public about criminals?

Names of released alien criminals is a matter of public record, but Judicial Watch is suing the Trump Administration for the names of those released during the Obama years. Why do they need to sue for what should be readily available? More examples of the illegal behavior of the "deep state" which continues unabated, regardless of who is in the White House.

http://www.judicialwatch.org/press-room/press-releases/judicial-watch-hearing-monday-june-5-homeland-security-assertion-privacy-rights-prevent-release-names-freed-criminal-aliens/

94% of DC and 87% of the surrounding counties voted for Hillary Clinton. This is the career workforce that makes up the deep state, or the so-called "swamp." Having an outsider in the White House is terrifying, even to many Republicans and Libertarians who wanted an old time pol who knew the game moves and rules. In general, Republican leaders have spaghetti spines--it's so much easier to go-along to get-along, and they are flummoxed by a man who won't play their games.

Republicans in DC have been the paramour/significant other for so long, they don't know how to be the legal partner in a marriage with rights and responsibilities.