Even if the attitude has been that fetuses don't have the same moral value as children or adults, that doesn't mean they shouldn't be given that same respect.
That's exactly the consequences of having lesser moral value. They are not and should not be given the same level of respect.
Ok, but I would argue that slavery and infanticide are both my business. Just because I am not directly affected doesn't mean it isn't my business. Body parts have nothing to do with my ability to add valid input.
Your ability to add valid input to a topic does not dictate whether or not it is any of your business. If you call a random fat girl fat, you have expressed valid input. It is not, however, your business to call her fat.
Ok, if I said that people shouldn't be able to urinate in public, I am dictating what they can and cannot do. Same story about murdering people. Is there anything wrong about me telling these people they cannot do these things? I doubt you would say that I am disrespecting the murderer or the publicly indecent person, would you?
You've mixed up two concepts here, respectfulness and correctness.
If you tell someone what to do, this is disrespectful because you are projecting your own system of correctness upon their behaviour regardless of their wishes. And this applies to both public urination and murdering.
Regardless of whether or not it is respectful or not, society dictates whether something is correct or not. In this case, calling someone out for public urination or murdering is probably correct.
Telling a woman what she can or cannot do with her body is profoundly disrespectful.
But why aren't they equal organisms? You keep saying they aren't and mentioning current public attitudes. What is your rationale behind them not being equal?
I would say that person-hood is the deciding factor