Wakefield was an eccentric nutter and fraud, found guilty and struck off.
He still has many anti vax followers and they also tend to be CC deniers. It's a syndrome, linked to creationists, brexiters, libertarians and other strangeness!
Mann was neither, was not found guilty of anything, was exonerated by almost the whole of the scientific community from the hysterical claims of the CC deniers, and the hockey stick graph is still the salient feature of the CC science.
You just need to catch up on your reading.
The reality is just so much more interesting than the crackpot burblings emanating from the deniers. They attract masses of attention, waste millions of hours and have effectively slowed down any efforts to ameliorate CC.
If the science is to blame for anything it is in being too slow and cautious to spell out reality, but then they had a media frenzy of stupidity to contend with.