Same way that you should probably be restricted from using me as a personal blood bank for nine months. I understand that you'll die without transfusions, but that's your problem, not mine.

It's not murder to not support you, just like it's not murder when the grocery store refuses to feed me for free, or when you refuse to open your house to me as a place I can live in, or when a doctor refuses to treat me, or when a prospective organ donor doesn't want to give up a kidney.

There are a few situations where this support can be compelled in our society, but we place an incredibly high bar on doing so, and an even higher one when it comes to questions of body autonomy.