A proverb warning that those with limited understanding judge a large/complex thing on partial evidence — criticism by the uninformed is untrustworthy.
専門家の説明を聞かずに批判するのは群盲象を撫ずというべきだ。
Criticizing without listening to experts is like the proverb 'the blind men and the elephant' — judging from partial understanding.
会議で素人の断片的な意見ばかり出ると、群盲象を撫ずになりかねない。
If only partial opinions from non-experts come up at the meeting, it may turn into a case of the blind men judging an elephant.