You're struggling unsuccessfully to find the connective tissue. Ferraris are designed and engineered to thrill and please those who can pay the price of admission, and to impress those who can't.

Assault weapons and high cap magazines are designed and engineered to kill or injure as many targets (read "people") as possible in the least amount of time and with the least amount of effort. Connecting such weapons to "fun" or "sport" is yet another hollow rationalization.

Adam Lanza's mother was a prepare and a survivalist. She bought a bushmaster not for fun or sport, but for what she felt was a valid purpose: self-defense in a post-apocalyptic world. Largely a fantasy. And a dangerous one at that. Had she not been able to purchase such deadly ordinance, it would not have been accessible to her mentally disturbed son. If he had had to rely on a less efficient weapon, the death toll at Sandy Hook would have probably been half what it was. Same for Aurora. Same for Columbine, et al.

Ordinary citizens do not need military or law enforcement-grade weapons and that has nothing to do with the 2nd Amendment. That is not a "well-regulated militia". And a sports car is not a weapon by design.