Edmure's people do not question Edmure or ask him if those are Robbs orders. they follow chain of command no questions asked. thats what soldiers do and have always done.
i truely dont think Robb was aware of all the consequences of his actions. as you say, he was a dumb boy, and he grew up with a father that idolized "honor". and so Robb, interpreted "honor" in his stupid 16 yr old way, and , well, RIP.
in winterfell it is said that 50 men can hold off 5000 men. it was built as a defensive structure for protecting itself from outsiders.
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