the HLA is the flag of the pro-life movement. it keeps focus on the issue at a national level.
Each state can be targeted more effectively, than trying to lobby the Federal congresscritter to do the right thing.
In the first place, they won't have enough money.
In the second, they will be seen as radical as the global warmists.
Each time the Feds have been wrong on legislation it has taken longer to eliminate it or a complete societal breakdown(Prohibition vs gang activity) to repair the damage.