They must not have had any sort of personal connection with the professor. It'd be worse to send empty condolences rather than being honest, it's better to be straight up. Being fake when dealing with someone's death is just as -blam!-ed up, and I can guarantee you, in 2 months the majority of the people that signed the cards will have forgotten about the entire incident. Also, maybe... Look, we can go off of what ifs, and what they felt, and what you felt, but the point is, they're not obligated to do anything in this situation.
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Just because they forget does not mean they stop caring.
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They, said it didn't matter. To me, that's a pretty being indication that they didn't even have a chance to forget. Look, just understand nobody is going to have the same ideals as you, and not everyone is going to approach each and every situation the same way you do. Just let them feel however they want, okay.
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I was talking about the others who signed.