NFD faces a c/r

[Ribbo]

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Betting gets value out of worse hands (when they call while behind) or gets them to incorrectly fold, ensures that currently better hands pay us off if we hit, and prevents truly horrible hands (that should fold the flop) from hitting on the turn and getting a chance to draw properly at the river.

Calling allows currently better hands to possibly lay down (correctly) to a turn spade, fails to extract value from bad hands that would have called the flop, but won't call the turn, and fails to protect our hand from truly terrible hands that would have correctly folded the flop, but now catch enough of the turn to continue.

This isn't even close.

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If someone is going to lay down if a spade hits to a $3 bet than that is definitely worth knowing, as this is clearly exploitable in the future. Plus the guy is folding incorrectly on the turn which is just as good as you stating he may "incorrectly fold on the flop".
Raising all in for the last $3 does not protect our hand as there are all of 2% of hands that we are ahead on the flop against. You need to learn terminology before you try to apply it to situations.