they bought it because they wanted it.
I have two coworkers, both female veterans, both had a tour in Iraq. One had a stalker a few years back, and went down to the gunstore to buy something to have, just in case he came back. Glock 23. She's never fired it. The other, last summer, decided she ought to have something, just in case. Kahr 9mm. Never been fired.
Multiple shooters at work have offered multiple times to take them shooting, and they say that they want to go, but they obviously don't. Not really. Otherwise, they would do it.
Wanted the gun, wanted to have something, just in case, but actually shooting them doesn't seem that important to some people.