What do you do if the man that put up the fence does not know why he put it up himself, or if he put it up for all the wrong reasons but is not there to explain them to you?
Hence the proper usage of "question authority": with all due respect[1], investigate the reasoning behind the authority's action and either be enlightened as to the reasons or confirm that the decision makers were, in fact, ignorant/idiots. Alas, the term got misconstrued to validating "ignore those who likely know better, and act confidently in your own impulsive ignorance."
[1] - "all due respect" has also been stripped of proper meaning, relegated to a barely-veiled insult.
"I don't know why this is here and I've tried to find out but hit a dead end so I'm getting rid anyway" is better than "I don't know why this is here so I'm just getting rid".
