What difference does it make if 70 - 80% are suicides?  An easily available gun makes suicide much more likely, and much more likely to be effective.  But regardless, are you suggesting that suicides shouldn't count in gun death statistics?
If anything, it only points out that 'health care' in America is such a bad joke that people will off themselves because they either can't afford decent health care or don't want to leave staggering medical bills to their families.
TDM is quite right in his statistics.