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I've always thought he was whining because he knew the Plan would not work, because things had changed. The Plan was designed for someone taking over a building, holding hostages, and demanding a ransom of some sort. Indeed, Hans even makes it seem like this is the case; assuming, correctly, that the police will follow standard procedures for such an incident. McCain (Bruce) knows the truth, that Hans is going to blow the building and it's not about hostages.

Pre-9/11, if a plane was hijacked, it was flown somewhere and there was some sort of ransom; no one thought a plane would be hijacked and flown into a building, so no one resisted.