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yes, but if he is stupid enough to connect the supply backwards he should have to pay the stupid tax - in this case changing the fuse. With luck they won't do it again.
Of course,if the device is used in a car(CB,Ham radio,etc),& has one side of the chassis connected to (supposedly) earth/negative,& you wire it backwards,you can still short out the car battery via the mounting screws.
Why not just use a full diode bridge and it doesnt matter which way you hook up the polarity?