i think in today’s world it is much more about personal self defense from other citizens, yes. I think target shooting is fun as hell so I get why people want to own them “recreationally”, however I doubt any self defense specialist would recommend an AR-15 for self defense.
If the government started a war on it’s people, no one’s gun collection is going to keep them safe, nor if the government called on it’s people to fight in a war, would they ask them to bring their personal weapons.
There is certainly an argument to keep guns legal, however I think today, has very little to do with what is written in 2a.
I think now more than ever things like the 5th and others that help people through the legal system are much more important and vital to keep us safe from overreach than owning guns.