PP has always been the target of the anti-choice crowd and they tend to be hyper emotional and focused on their religious beliefs that life begins at conception and all that nonsense. They feel it is "God's will" that they impose their views on the rest of society and will go to any lengths necessary to control other women.
Rather than simply elect to not have an abortion themselves, or to not visit PP if they don't like them, they feel that isn't enough and it is some kind of higher mission to interfere in the lives of women they don't know or understand.
The fact that PP likely prevents far more abortions than it performs by preventing pregnancy with free/low cost contraception doesn't matter, because these people are on a mission and are blinded by sheer emotion. Facts can't get through.
They also refuse to hear that federal funds already do not cover abortion services, but the other services like life saving cancer screens. The people with the allegedly pro-life agenda don't care a whit about the lives of the women PP saves from cancer. They only care about protecting a fetus. The already born have far less value to this crowd.
They know strategically if they can take out Planned Parenthood, it will devastate women's reproductive choices in many areas throughout the country - and that control over women is precisely what they want. It just sounds better when they say it's about protecting the "rights" of the unborn. What about the woman's rights?
These same hypocritical people would probably be more than happy to try treatments that come from stem cells or medications that use fetal cells in their ingredients though.
For some, it's not enough to leave a woman to make her own legal, medical decision. They want to insist women as a whole are too stupid to know and research the choices they make.
They also insist on "abstinence" sex ed in many areas, so many young people end up clueless about how to protect themselves from pregnancy and disease. Look at Yahoo Answers and all the kids asking questions there - it's heartbreaking.
These people are also afraid PP might give their kids contraceptives and teach them something too I'd wager. We cant have empowered young people (who are sexually active anyway despite abstinence education - Bristol Palin anyone?) If we leave them in the dark and clueless, that's a much better approach I guess. sigh.