The same fact can be presented honestly and still leave out something needed to understand it.

Honesty and completeness are not the same thing. Every true fact sits inside a context, and choosing which context to omit can steer someone as effectively as a falsehood while each individual sentence stays defensible. Most misleading happens this way, often without any intent, simply because the speaker knows the missing piece and forgets that the listener does not.

When you explain something, ask what a fair listener would need in order to weigh it: the comparison, the timeframe, the exception. Add the inconvenient part yourself. On the receiving end, ask what else was true at the same time.