Will banning guns for law-abiding citizens help when law-breakers have guns with them?

Banning guns may not be the answer because the criminals have too many guns already- see below

http://www.nationalreview.com/articles/335739/facts-about-mass-shootings-john-fund#

“With just one single exception, the attack on congresswoman Gabrielle Giffords in Tucson in 2011, every public shooting since at least 1950 in the U.S. in which more than three people have been killed has taken place where citizens are not allowed to carry guns.”

Gun crime in UK rose sharply after handgun ban.

http://news.bbc.co.uk/2/hi/uk_news/1440764.stm

http://www.dailymail.co.uk/news/article-1223193/Culture-violence-Gun-crime-goes-89-decade.html