The album notes don't give the lyrics, but here are the notes for "Leslie":

LESLIE (Just a Lone Stick of Wheat)
An all too common tragedy these days with so many people walking the streets and wondering ‘what it’s all about’. Perhaps Leslie had so much more to offer the world than his depraved industrial society required of him.
Like Calum More Leslie was a gentleman when sober but a stranger to all when drunk. At the age of 29 Leslie died of exposure in a derelict building.

The recording: https://www.youtube.com/watch?v=_gOWwReAX8g

Can't really see how this is an anti-abortion song, but it certainly is "pro-life."