Planned Parenthood is Not Selling Baby Parts, You Fucking Idiots

Why would a group with a vested interest in having Planned Parenthood shut down just release a video of Planned Parenthood admitting to doing something illegal that could potentially get them shut down not go through legal channels with that evidence? I mean, if their claim is true, it could get PP shut down. Why present it in a way that elicits an emotional response rather that have it judged on its truthfulness?