As has been pointed out in some detail by others, only about 3% of Planned Parenthood's financial resources go toward abortion. The majority goes toward things like sex education, cancer screenings, etc. Defunding PP based on breathless gossip of "selling baby parts!" would only make life and parenthood more difficult for the lower-income young mothers who need its services the most, not to mention their children.
Also, defunding Planned Parenthood wouldn't stop abortions. Re-criminalizing abortion wouldn't stop abortions any more than Prohibition stopped people from drinking. All it would do is drive it underground. Rich women would go get abortions in Canada, and poor women who get them in alleyways from quack "doctors" and end up dying of infection, just like in the "good old days" of the 1950s.
So frankly, some of the right-wing's crusading against abortion and Planned Parenthood comes across as a veiled attempt to subjugate women in general and especially lower-income women.
Also, while it's a gross exaggeration to say Planned Parenthood was "selling baby parts", what should be the alternative? Abortions are going to take place, whether they're legal or not, and the human tissue left behind could prove a very valuable resource for medical research that could save lives, which is otherwise difficult to legally obtain.
At a certain point, you have to set emotion aside and look at the situation objectively.