So you don't want the rifle for the targets then? You REALLY want it for "home defence" ?
No, I want my rifle to follow my sport, if I used it for home defence I would A). lose it and B). probably finish up in jail.
Shooting targets isn't necessary - and it is a sport in which the tools you use for that sport are terribly dangerous in the wrong hands.
So are cricket and baseball bats, hockey sticks and bows and arrows - no sport is 'necessary' but that doesn't mean that people who want to should not participate - welcome to democracy.