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I'd be worried about anybody who couldn't construct a plausible layout where an opening heart lead is necessary to beat the contract.
 
OK, give me one.  Take your time... 
I can think of a couple but I can think of more where the spade lead is right or there is always time to switch.
It's not obvious that the 
♠K lead had criminal intent and the carding/timing of the overtake is merely competent signalling.  
I make the 
♥ lead vs the 
♠ lead pretty close to 50-50 despite my personal preference for a 
♠.
I don't disagree with the idea that a 
♥ lead may be best but strongly disagree that the defenders should have their ethics questioned on such a flimsy basis.