My father and I were out of contact for 17 years. Whether or not he 'truly' loves me or what he would for me do was never part of the equation - I can't tell you if he does or doesn't, or what he would or would not do, I don't think there is a way to truly know something untested.
I never viewed or called it 'going no contact', I don't think that language was around at the time for it. Like others have said, someone can be willing to do a lot of good for you, but also be a risk of doing a lot of harm. The latter was my concern, particularly once I was pregnant. It took a genuine apology and awareness from him as to why those concerns had some merit and after the initial reunion where we both discussed the issue, our shortcomings, changes over the years, we still don't talk that much, maybe once or twice a year by email. I think now that we've made peace with our past, no matter how we feel or what we would do for each other if it became needed, neither of us have that need anymore for that contact. We've built our lives separately.
No of course not. Going NC in many instances IMO is a “new” punishment for younger generations to use when they don’t like hearing the truth from others
As others said, for some it's a long, difficult decision of balancing pros and cons, benefits and risks. For others, I suspect it's someone they didn't really enjoy talking to anyways and just want a socially accepted language to stop doing so with people that we're expected to maintain good relationships with.
I know my mother was pressured by her father to maintain a relationship with me. I also got the letters from him about how he wished to see us together and the importance of family, and that was while my mother and I did talk. We had a tense relationship during and after she lost custody when I was a teenager. About 14 years ago, just after my youngest was born, she went NC with me and made it so I've no way to contact her This happened supposedly because I told my sister how tired of her gossiping about me I was & my mother didn't think I should have done that, but I think she was looking for any reason of me doing 'wrong' to stop keeping up the pretence that she had any interest in having a relationship with me. I still maintain the email address she has for me just in case, but she's well into her 60s now and with no family pressure anymore, I don't think that's going to change.