As the title. Why are some things allowed, e.g. the modifications to the wh east wing, while others are halted e.g. some states redistricting plan?
Also, why is the law so weak as to be frequently weilded as a strategic weapon/ shield if youre sufficiently well connected? Same can be asked of religion, actually.
Generally, a preliminary injunction will be called for if the action is harmful and irreversible, if delaying it while the question is resolved wouldn't cause significant problems for the party being sued, and if the requesting party is likely to win the lawsuit anyway.