The "blues" created the legislation & forced the workers to accept a shitty contract with no sick days. They could easily have refused to vote for it and let the strike happen w/o real sick days.
Umm, if everything was built around the idea that tweets were immutable, yeah I could imagine it's quite a bit of work to change things. Immutable and mutable data can be treated _very_ differently in systems bigger than the little toys you make for fun.