I don't own a firearm because I have teenagers, and
keeping a weapon in your home increases the likelihood of your child committing suicide or causing an accidental injury.
I have a good friend that I used to work with, a police sergeant, whose daughter killed herself with his service revolver about 14 years ago. I also had two friends in high school that killed themselves using weapons they found in their homes. Those situations have stayed with me, and I simply am not willing to take the risk. Kids are impulsive, and many teenagers experience suicidal thoughts. A kid can take an overdose of pills, have a second thought, and easily survive, but a gunshot to the head is permanent.
To protect my home, I have a pitbull mix, instead. She has a very menacing bark, a strong jaw, big teeth, and hates strangers. But, she's a cuddle bug with her family, her kitties, and her bunny.
I have zero problems with firearm ownership, however, and concealed carry permits. I feel I have a right to own a weapon, but the risks outweigh the possible positives.