Nobody is perhaps a little over the top I agree Frank...the vast majority is probably more accurate.
Don't underestimate the resentment from non-Londoners about the excess of spending in London/SE, and lack of it everywhere else...it's a sure fire subject to get folks back up.
Then add local, and vocal, NIMBY's and spineless politicians to the mix...it's going to be an uphill battle to expand LHR in my humble opinion no matter what any committee recommends.