Yes I think part of maturity is learning not to assume anything about other people's intentions and to give people the benefit of the doubt. I have been guilty about thinking I "know" something about why people are doing this or that and occasionally I've been wrong. So I try not to do that in a negative way, even when I might be prone to suspect something. Sometimes I do the opposite now and assume they have good intentions. I do think it's natural for Ni types to immediately go into "where is this coming from and what does it mean" mode.