I’ve always said that you can ascribe motivations for what people do but you can never really know for sure if you are correct. You could be wrong. You can talk to the person about it but they could lie to you, they could be in denial, or they could be totally unaware of their own real motivations about something.
Which makes it all the more interesting to me as inspiration for my writing. Something occurs and I begin to wonder. Why? Why did they do it? Is it why I think? Or is there another reason? A story begins to form.