I don't think this argument makes much sense. If you are running down hill towards a cliff then saying that adding a cart to speed up the process doesn't give the cart moral blameworthiness is an unhelpful observation. You can still chose to stop running down the hill or to not get on the cart.

Exactly! Was going to make a similar comment if I didn't already see one. People keep saying things like this and drives me fuckin' nuts. It's not that there are no positives but I don't see how the positives outweigh the negatives.