Abortion is morally wrong

[Ben Davis]

...the premise is that you made a choice that led to an implicit responsibility for THAT PARTICULAR moral subject or entity... you made a choice that lead to that subject being dependent upon you and you, in my estimation, have a moral responsibility to adhere to that consquence until such time as you may safely abdicate it to another

The problem with the 'responsibility' argument is that the means test for abortion becomes 'Were you aware of or subject to your responsibility in the circumstances surrounding conception?'. This is an near impossible test to administrate because of the possibility of diminished responsibility. A just system would have to establish responsibility before preventing abortion (rather than assuming responsibility and trying to establish irresponsibility before allowing abortion). So though this may be a powerful personal argument, it is of no use when setting legislation: the amount of time and evidence it can take to establish responsibility is reason enough to reject your argument as a mechanism for legislating abortion-practice.