Getting involved in picketing isn't necessarily the same thing at all - it could well be that a higher proportion of women opposed to abortion might recognise that as a futile and counter-productive exercise, and prefer to get involved in other ways, especially those where men wouldn't have a direct role to play in one-to-one support work.

I suppose it is just about possible to argue that being opposed to abortion is consistent with being in favour of state killing of people convicted of capital crimes. But I don't think it's consistent with using the label "pro-life". Indeed people who are against the death penalty, but in favour of abortion could use the label just as appropriately, and it'd be just as much of a distortion of language.