1 Corinthians 13:4 Charity suffereth long, and is kind; charity envieth not; charity vaunteth not itself, is not puffed up, 5 Doth not behave itself unseemly, seeketh not her own, is not easily provoked, thinketh no evil; 6 Rejoiceth not in iniquity, but rejoiceth in the truth; 7 Beareth all things, believeth all things, hopeth all things, endureth all things. 8 Charity never faileth: but whether there be prophecies, they shall fail; whether there be tongues, they shall cease; whether there be knowledge, it shall vanish away. 9 For we know in part, and we prophesy in part. 10 But when that which is perfect is come, then that which is in part shall be done away. 11 When I was a child, I spake as a child, I understood as a child, I thought as a child: but when I became a man, I put away childish things. 12 For now we see through a glass, darkly; but then face to face: now I know in part; but then shall I know even as also I am known. 13 And now abideth faith, hope, charity, these three; but the greatest of these is charity.
In Christ's love, I would not call any one stupid, especially since whatever we know of the truth is because He enables us to see the truth.
1 Corinthians 3:5 Who then is Paul, and who is Apollos, but ministers by whom ye believed, even as the Lord gave to every man? 6 I have planted, Apollos watered; but God gave the increase.7 So then neither is he that planteth any thing, neither he that watereth; but God that giveth the increase.
Even Jesus prayed on the cross for the Father to forgive them for they know not what they do. So I do not believe we should be assigning the label of "stupid" to anyone being fleeced and just following the crowd when obviously, they know not what they do.
Ignorance can make us angry, but even though you did not say that to any one in reply, I am sure there are believers out there that do not care to be reminded of their shame in following the crowd that the Lord had delivered them from in so doing. Instead, they should be thankful to Him & rejoice.