Really in what universe is a grenade or a rocket launcher a great home defense weapon. If you think they are great, then that pretty much disqualifies you from me treating your opinion of adequate seriously.
Hell a Prius, or worse a Nissan Versa is an adequate vehicle for probably 95% of the trips in this country a flip top phone is an adequate communication device.
As for this being a fantasy scenario that a AR 15 is useful for defending. The amnesia on this place is pretty awful. This incident happened just last November. While I have not found a site for statistics on the use of AR-15 style weapons for self-defense, a quick google finds dozens examples. Overall the low estimate for self-defense uses of firearms is over 100,000 per year the high estimate is over two million. "Assault rifles represent at least 5% of the 350 million firearms, but less than 10%. This implies they are used many thousands of times a year for defense, at or 10-100x more often than they are used for mass shootings.
A few minutes after 11 a.m. CST, on November 5, 2017, Devin Patrick Kelley arrived in his pearl white Ford Explorer SUV at the First Baptist Church in Sutherland Springs. He parked close to the door, in a spot vacated by a parishioner with chronic lower back problems who had left the Sunday services early.[citation needed]
About 11:20 a.m., Kelley stepped out of the SUV, wearing black tactical gear, a ballistic vest, and a black face-mask featuring a white skull,[6] and wielding an AR-15 pattern Ruger AR-556 semi-automatic rifle. He approached the church from the right, opening fire on and killing two people outside the church and continuing to fire on the building itself. He then entered through a right side door, where worshipers were attending regular Sunday service.[citation needed]
Inside, he yelled, “Everybody die, motherfuckers,” as he proceeded up and down the aisle and shot at people in the pews.[6][7] Police found 15 empty magazines capable of holding 30 rounds each.[8][9][10] According to investigators, the shooting was captured on a camera set up at the back of the church to record regular services for uploading online. The footage shows Kelley methodically shooting the victims, pausing only to reload his rifle.[11]
As Kelley left the church, he was confronted by and traded fire with Stephen Willeford, a local resident and former NRA firearms instructor[12] who was armed with an AR-15 pattern semi-automatic rifle. Willeford had taken cover behind a truck across the street from the church and shot Kelley twice, once in the leg and in the upper left torso under his tactical gear.[13][14][15] Kelley, who had dropped his rifle upon the initial fire with Willeford, fired back with a handgun before fleeing in his Ford Explorer. Willeford fired one more round as Kelley sped north on FM 539.[16][17] He then noticed a pickup truck parked at the intersection of 4th St. and FM 539, driven by Johnnie Langendorff.