Kangaroo-
This seems to be more about how comfortable you feel nursing in front of people you know. You don't feel comfortable with that. Maybe you had a bad experience NIP. Maybe you were raised with beliefs about what is considered appropriate social behavior concerning your body. Maybe NIP never came up before you had children and you are doing this because you believe you are making your family members more comfortable.
That's fine.
But, the theme of your posts seem to suggest that women who feel comfortable NIP and friends/family (and I nursed often in front of my in-laws, who had bottle-fed, with no problems) are somehow trying to make a political statement out of every feeding.
This is usually not the case. I usually thought, "Oh, Eric's hungry, let's eat!" vs. "Oh, what a great oppurtunity to whip out my ta-ta's and force everyone to watch me exercise my rights! Bring me the baby! My nipples await!"

The case about the woman with the baby on the ride, if that's even true, is so far from any regular NIP event that it doesn't even apply to this thread. I mean, come on. Hopefully CPS removed her baby to safety while she hunted down a lawyer to sue the amusement park!
And the no-shirt, no-shoes situation is also outside the realm of the usual. I mean, the idea of a woman walking into the 7-11 shoeless and topless with child hanging off her breast? I'd like a show of hands for everyone who has witnessed that!
I never NIP to make people uncomfortable. I did NIP at WIC (for a class) for pregnant women who were interested in nursing, but
had never seen a woman nurse in real life. How freaking scary is that??
I am not trying to diminish your questions. But it seems to me that you have your beliefs about comfort levels and discretion. I don't think anything we say is going to change your mind.
But I'm pretty comfortable with my comfort levels... and that will include NIP w/family and friends. Not because I'm trying to change the world, but because I believe in bfing my child.
But, if I change the world while breastfeeding... That would ROCK!