Okay, from your view:
1. Unborn baby in womb = any human born
2. Abortion = murder
Let me ask you this now:
If you knew someone was going to the local park to murder masses of people, and there was no law against terminating the lives of people in the park, wouldn’t you still try to prevent it from happening? Even if it meant killing the person who is/was trying to kill innocent people in the park?
If so, why wouldn’t you stop an abortionist (which you already absolutely know kills “innocent babies”) at all costs?
First of all your analogy is completely broken. In the case you describe there is an illegal act occurring. In the case of abortion, it is currently legal, even if wrongly so.
As a nation of laws when a law is unjust we are called to non-violent civil disobedience to change the law. There is a right way and wrong way to approach a problem. I have put in numerous hours and miles protesting abortion and praying in front of abortion clinics. Until today we were winning this battle...this one act has set that progress back immeasurably, which will ultimately lead to many more innocents being butchered.
I would bet most of the armchair cheerleaders for this act have never once lifted a finger (let alone gotten their butts off their chairs) to do anything about abortion.
And since you “don’t really care”, you are as responsible as Tiller.