Then turn around and say how evil we were for bombing Dresden.
Is there really a contradiction there?
"Bombing the camp" probably means destroying the rail approaches or taking out the crematoria, not killing the prisoners.
The point is, that they always want to blame the US for everything.
If you look at WWII bombing accuracy a lot of prisoners would have died. And Nazis would have quickly repaired the rail yards and the crematoriums.
Brining Jewish concentration camp prisoners to the camps had a higher priority then German troop and ammunition movement. There are multiple stories of German supply and troops trains either being commandeered to move prisoners or being held up. Killing innocent people was more important then military operations to the Nazi mind.
We actually did bomb Buchenwald on 24 August, 1944. 2000 wounded, 388 dead, no escapes. Even at that stage of the war, “precision” bombing wasn’t.