I believe we should not allow concealed carry on the basis that it's more likely to cause a murder than prevent it. Washington DC's low murder rate of 69 per 100,000 is due to strict gun control, and Indianapolis' high murder rate of 9 per 100,000 is due to the lack of gun control. This shows that in areas that lack gun control are more likely to show high murder rates.
I believe that we should have concealed carry nation wide for a few reason. My first reason is that the 2 amendment says that we have the right to bear arms and bearing arms literally means to carry guns. Secondly there are multiple cases were citizen who where carrying have intervened and saved many people. One of these cases is the Oregon mall shooting. A man started opening fire in a mall but then a citizen who had concealed carry confronted him and stopped him from shooting anyone else. So for these reasons I think we should have concealed Carry nation wide.
For my last argument I would like to talk about how Switzerland has the lowest crime right in the world. How to they do it you may ask, well they have concealed carry. But France and England who have very strict gun rules still have a very high crime rate. So after all of these facts it is obvious we should have concealed carry nation wide.