...They basically paint big targets on themselves then go off to a remote locatiion precisely in order to protect others.
Actually, they attempted to first
lead Javier Bardem astray (heedless of any possible collateral damage,) then
direct Bardem to Skyfall only after they had succeeded in preparing a rather better ambush than the one they could only improvise. Q of course failed as he failed in everything, but that is what Bond and M asked for.
There is very little evidence that any intelligence service beyond diplomats collecting public information and private communications from host government officials has ever contributed to any nation's security. And all the known evidence indicates that covert operations of the Bond variety merely impair relations or create new enemies. Trying to take this movie seriously on any level is like hitting yourself in the head.