His successors...
His successors, and after them, the Abbasi khalifas, patronized the “industry” which for a long time was busy churning out hadith . Though Shibli claims that hadith was expurgated by highly critical, perceptive and analytic censors, there was much that escaped detection by them, and is accepted today as genuine by a vast majority of Muslims.
Muawiya appointed a team of men to make up statements favorable to himself and to the other enemies of Ali, and to attribute them to the Apostle of God as his own hadith . At the same time, he suppressed or tried to suppress the genuine hadith which were complimentary to Ali, and ordered his team to manufacture hadith derogatory to him. The members of this team concocted hadith of both varieties, and he put them into circulation.
After the death of Muawiya, this campaign was carried on by his successors. Their “ghost-writers,” “public relations personnel,” and “image-makers” skillfully blended fake hadith with genuine hadith , and synthetic history with factual history, hoping that the “mix” would “jell,” as part of the sacred lore of the Muslims.
Muawiya had one more reason for going into the business of “ hadith -production.” He knew that the generations of the future would judge every Muslim ruler against the ideal ruler – Muhammad. He knew too that if they did, they would find him poles apart from Muhammad. He was also aware that no matter what he did, he could never rise as high as Muhammad; he knew in fact that he could not reach the heights attained even by the slaves of Muhammad.
But it occurred to him that though it was not possible for him to reach the sublime plane on which Muhammad stood, it was possible for him to bring him (Muhammad) down to the plane on which he (Muawiya) stood by the simple process of tarnishing his (Muhammad's) reputation, so that he too would look like other mortals.
Muawiya hoped that the indictment of the historians against him would be less severe if it was shown to them that even the most perfect man – Muhammad, God's Own Messenger – was not altogether free from blemishes of character. Clearly, much of the content of hadith literature was a conspiracy for the character assassination of Muhammad, the Messenger of God. Muawiya and the other entrepreneurs of his “cottage industry” were “successful” in their attempt at the character assassination of Muhammad.