A lawsuit is never meaningless. One doesn't stop trying to enforce the law because a criminal is persistent. And someone that willingly breaks a law for immoral reasons and without being willing to face the consequences is a criminal.
And injunctions are far, far from the point at which things are "declared unlawful".
Trump's border czar [Tom Homan]: "I don't care what the judges think" - https://www.axios.com/2025/03/17/tom-homan-deportation-fligh... - March 17th, 2025