Statistics Kevin, statistics. The facts are right before you. Accidents like the ones you are describing are vastly outnumbered compared to ones simmilar to my example.
You are more likely to be murdered in Britain now than you were when guns were legal there. Your deduction is based on faulty logic. "America has less gun restrictions than other countries and more murder, therefore less gun laws= more murder." Truly you can only compare cases where the variables are accounted for. In order to get accurate information it must be the same genral local with and without guns that we compare.