I've always had a taste for machines and tools that are designed for and/used for fighting, killing, and destroying things, as per part of my 'manstinct' that I have. Even though I never intend on using them against people or property unless deemed necessary, I still find it fun to learn how to use. It's kind of like why alot of people learn boxing, martial arts, etc. etc. to me. It makes you a stronger person physically and intellectually, among other things.
Also, it beats sitting inside doing nothing. Since I also dont have a shooting buddy or know of anyone who likes shooting near me, going to the range is also 100% me-time. I love me-time.
I remember before I got into shooting, a boss of mine at an old job I had at a golf/driving range and putt-putt told me this when I asked him why he went shooting: "it's alot like golf, except instead of hitting balls out to flags, you buy bullets and shoot s--t." That is also a good way to look at it, since so many people like golf nowadays.