Not only is there no end in sight, the number and intensity of mass shootings is increasing. 

https://www.washingtonpost.com/news/politics/wp/2017/10/02/americas-deadliest-shooting-incidents-are-getting-much-more-deadly/?utm_term=.a1537875fc57

https://www.nytimes.com/2014/09/25/us/25shooters.html?mcubz=1