Murder is a legal concept. If a soldier kills its not murder, if you kill in self defense its not murder. This is what the whole argument is about.
The deeper problem is at what point does human life begin. Conception, birth, heartbeat detected?
For me its simple, the point is when life as a human being should be at the point when “stand alone” life is possible independent of the mother. Don’t know how many weeks that is but it’s a fair baseline.
What I don’t get about the abortion debate is how can you prevent it. If legal (safe) abortion is outlawed it doesn’t preserve the “life”. The mother simply goes to the backstreet abortionist or gin bottle like they did in bygone days.
In reality the best solution is to focus energy on preventing unwanted pregnancy be it education or pills and potions. We have the technology !