Because you want one, AND the right to bear arms is guaranteed under the Second Amendment! The only reason to get today’s civilian version of the AR-15 is that you desire to own and shoot one. I am first and foremost a hunter who shoots targets too. And to protect my family and home.
It was and still is the political left that wants to take guns away along with your second amendment rights.
We must endeavor to stay up to par with the marksmanship and shooting skills of our military. Civilian Marksmanship and Hunters are the prime contributors to our military during wartime. The finest of the worlds snipers cut their shooting teeth in the deer woods.
Even though the AR-15 civilian version is simply a semi-auto like many guns of the post WW II era, it is very accurate, little recoil and shoots with a 20 or 30 round magazine. It evens up the disparity of military vs civilian rifles significantly. The AR-15 in some barrels allow bullets in the 75 to 80 grain class thus the deer hunter can use it effectively too. Reloading the .223 Remington is a must for deer and predator hunters so that you can optimize bullet performance on game and keep shot cost down.
I am no expert on this rifle per se as it requires study to master its value. I have found, however a nice nested group of articles for you to read by Scott Powers of Sniper Country. Enjoy!
Guns when not in use are securely locked in safe place and away from any unauthorized use.