Zapper laser sight for when you have to kill John McClane

With the Wii Zapper being kind of hard to find at the moment, alternatives are being looked at by those who need a plastic thingamabob to place their Wiimote and nunchuk into. For us, we're fine with, you know, just holding them as we would in any other game. But, even if we wanted a Zapper (or knock-off) for any reason other than Link's Crossbow Training, why would we go with this one?

It looks functional enough, but what's the deal with the laser sight? Why would we even need one? There's obviously no need for it and it's definitely not going to be accurate.