This boils down to basic world views about life and the purpose for existence.  Planned Parenthood has a published world view, which supports their moral justification of abortion and homosexuality.  They are a propaganda machine for their world view, which stands in direct contrast to the Christian world view.  They want to be in your school pushing their belief, as if they were facts and your children won't even know when they have stepped out in faith in such beliefs, until it's too late.  The abortion rights issue is a bright light that exposes the intents of the heart, it shows you what you have believed and the ramifications of such beliefs.