Attacks on the camps would've done nothing to shorten the war. Every bomb dropped on Dachau would've been a bomb not dropped on ball bearing plants, synthetic fuel plants, aircraft factories or steel mills.
By ending the war even a month earlier, how many of those in the camps were saved?
Bush's statement also inadvertently slanders FDR, Ike, Hap Arnold, etc., by suggesting they should've done something that was not supported by the information they had to work with or the objectives they were sworn to achieve. It's armchair quarterbacking of the worst kind.
Indeed, with perfect hindsight, it's kinda like blaming the Bush administration for invading Iraq because there were no WMDs...
RAIL LINES...R A I L L I N E S!!! HUGE diff, OKIE.