"Plastic is for water bottles and most automobiles interior parts."
And other disposable commodities.

On the other hand, if you use a gun defensively you'll likely have it confiscated (at least temporarily) so no big loss.

(PS: ditto on "what the heck is FDE"?)

And, what's with the title:
"smith and wesson needs to make all their guns fde"
All of them? Does that include stainless and blued steel revolvers? Seems a bit myopic to think that S&W deals only in plastic, doesn't it?