Yes, a gun is a tool.
It is a tool to help one feed one's family when used for hunting.
It is a tool to help one protect one's family when used for personal protection.
It is a tool to help one protect one's community when bad guys move away because practicing murder, mayhem, rape, and robbery is not conducive to their health.
But it is so much more than that. It is an venue for recreation and enjoyment. That is why we call what we do "shooting sports".