It may be so, but there may come one who speaks loudly and who speaks with love. But if he speaks proudly, it is never in love. And the speech of one who is contentious is far different that one who proclaims truth. The contentious person may speak truth but it is not in love, but in pride. Doctrine is important.
Error is as a cancer, a malignancy.
Error in doctrine has condemned millions to hell because they went through life trusting in a man-made doctrine, a doctrine of truth modified by men, instead of truth once delivered to the saints by God. So it is an evil to be resisted. It is an evil to be confronted. It is an evil to be condemned. It is an evil to be exposed.