Everyone has an opinion!

Why do people insist on voicing their opinion about everything to everybody? I  think if people minded their own business the world would be a better place. Of course there are instances where you must get involved. For me if it involves a person or animals safety, I butt in, otherwise I dont care. I see a lot of this on social media. Some people get really nasty with their responses to others posts. Im always thinking to myself, Who ask you?. Do you ever wish people would butt out of your business?