A sniper shouldn't have a snare, that it can damage light vehicles ok but a snare is just wrong imo. A light vehicle should be a hardcounter to a sniper! If you buy a sniper you should be prepaired to counter a light vehicle with mines and stuff not with the sniper it self.
That the other infantry units dont have a snare is not a reason to give it to a sniper.
Remove the snare from the sniper and find another solution (if needed) for the brits not having a snare.
He carries an anti-tank rifle. A weapon designed against Scout and Armored cars. It makes total sense.