
Everyone is gonna weigh in, realistically. If you attack the ability to have a value judgement, rather than the value judgement itself, you're gonna lose most debates, or at least end up at loggerheads. Because you can disprove that it's murder, but you can't disprove that they should be able to speak on an issue. And obviously if it were murder, they'd have a moral imperative to speak and stop as much of it as possible. So that's what you have to attack, the opinion, not the ability to hold it.
Because the charge against abortion is that it ends a human life. If so, that's pertinent to all society. We don't "mind our own business" on cases of murder. The successful counterargument isn't to disallow that value judgement, but to disprove it. Anything else is a waste of breath.