This thread annoys me.
Someone will use a sxs for defense, and thats ok; but because it has a light, which is unquestionablly useful; theyre idiots??
If you are a mere collector or guns, its fine to say, "ick" or "blastphemy!", but if a modification, or a look enhances the function of a gun ESPECIALLY when its used for gunfighting, its all fair game. A armed thug will not care if you are true to the memory of John Wayne when you ventilate him with a 30-30 or buck from a 12ga.
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I agree with the principle of what you are saying but why not then just switch to a pump shotgun or an auto, or anything with more than two shots? I don't see the practicality of putting a light/laser on a gun that you are going to have to reload every two shots.
The SxS is good for home defense if it is all you have, but if you have the money for a $200 red dot and a $300 light on top of your SxS why not just get a cheap $200 Maverick 12 instead and have the option of 8 shots without having to worry about reloading. It just doesn't seem that practical for home defense.
On the bright side, maybe the owner of the tactical S&W revolver just found his new favorite shotgun.