Those sentiments aren't being echoed in my world. As the old saying goes, "a poor craftsman blames his tools". DHL Mgmt knew the game and knew the rules before they chose to play. Therefore they should have forseen the likely obstacles and had a plan to deal with it.
It's not as simple as that. Deutsche Post looked at the takeover of DHL in the global context, not just the US internal operation.
They were coping with the US's anti-competitive protectionism reasonably well, but the global slowdown changed all that.
The fact remains that US protectionism has backfired in this case.