I think it was short sighted by McLaren.
They appear to have a car fast enough for both of their drivers to rival and beat Max.
Max is 76 points ahead of Norris now....could have been 69.
There are 11 races left and in a perfect scenario of Mclaren 1,2s with Norris winning and max coming 3rd everytime that is 110 points.
Obviously the above is unlikely, but it could swing either way and it shows it is still fairly possible Norris could win. McLaren could get even luckier if Max has a few DNFs.
If Lando ends up losing the championship by 7 points, McLaren are going to feel very, very sick and Lando would probably be furious.