My experience is that whether “asking why” is welcomed or not dramatically depends on HOW I do that. Usually we have a suspicion that let us start asking questions. If I do that in an absolutely (i.e. as much as I possibly can) neutral way without implicit offence and showing off as the president of Dunning-Kruger club, then I often get a positive reaction — no matter whether there is an answer.
My conclusion is, criticism by itself is almost never the problem (assuming a minimum level of civilizedness). Sensing superiorness is the problem — no matter if wrongly interpreted from my behaviour or I intended it and did not succeed in hiding it.