Once, again, America has experienced a deadly mass shooting.
A Dreary and familiar ritual will begin.
There will be "Thoughts and Prayers".
Then everyone will retreat to their prepared positions and start screaming.
The Government will do nothing. 
And it will happen again.

One argument of the pro-gun crowd is that the real problem is not guns, it's mental illness.
OK. anybody who shoots up a school, or a concert is obviously dangerously insane.

However, The United States has many many more mass shootings than do other developed countries.
Why?

IF the problem is mental illness,  AND, we have more shootings than do other countries,,,,,,,,,,,,
then do we have a higher incidence of mental illness than do other countries?
I've seen no data to suggest that.

Do other countries have better mental healthcare systems than we do? I thought that we had a much better system than those pansy Europeans with their universal healthcare.

I really have huge problems with the mental illness explanation.
IF the incidence of mental illness in the US is about the same as it is everywhere else.
And
IF serious mental illness is just as difficult to treat in Europe as it is here
Then, there has to be something else causing the difference in shooting rates.

The difference is guns. Specifically military style semi-autos.

They got crazy people in Europe too. They just don't all have AR-15s.

Pretty simple really.