Why do mass shootings often arise in the US?

When the world looks at the most developed country, the U.S., they have different notions about them, some people think that they are the pioneer of hip-hop music and action packed flicks while some think that they poke their nose in other countries' foreign policy. But between all these the one question that always comes in everyone's mind why do mass shootings happen there frequently?

Mental Health Crisis: If we talk about the latest mass shooting that happened in a Florida high school on Valentine's day where a nineteen year old boy, Nikolas Cruz started firing at innocent students and teachers was suffering from a mental health crisis. About 5 percent of 120,000 gun-related killings in America between 2001 and 2010 were committed by people with a diagnosed mental illness.

Highest Rate of Gun Possession: The U.S. has the highest rate of gun ownership in the world. Unlike, a car getting a gun you don't need a license in most of their parts. Only 14 states require permit to own a gun.

Different Races: Two researchers, Jaclyn Schildkraut of the State University of New York in Oswego and H. Jaymi Elsass of Texas State University, researched on mass shootings in 11 countries and they observed that the U.S. is full of different mentality type people as compared to other countries that leads to social discrimination and differences among them.

Cultural: It is one of the prime reasons for mass shootings. Next to Mexico, the U.S. people have an upbringing that they have inherent rights to have possessions of guns. The gun ownership is so weak that one can order guns online and get them at their doorstep.