One reviewer of the IPCC 2007 Assessment Report specifically asked IPCC not to hide the decline. The reviewer stated very clearly:
Show the Briffa et al reconstruction through to its end; don’t stop in 1960. Then comment and deal with the “divergence problem” if you need to. Don’t cover up the divergence by truncating this graphic. This was done in IPCC TAR; this was misleading (comment ID #: 309-18)
The IPCC said that it would be “inappropriate to show recent section of Briffa et al. series“.