A poll on whether access to legal guns impacts "gun violence" is worthless. That's totally unscientific.
Unless 97% of respondents agree, of course! 
Stats can show correlation: trends, comparisons, changes, etc. They cannot identify causation.
The gun debate will never be won by either side using stats. The numbers are sometimes interesting, but without including all the variables that make one use of forearms more or less desirable than another, stats are useless.
Example:
ACTION: Place strict restrictions on LEGAL firearms purchases so buyers opt to not buy a gun. High firearm taxes have been used in some places for this purpose.
CHANGE: 50% fewer people purchase firearms that year.
RESULT: Number of LEGAL gun-related crimes drop 10%
CONCLUSION: Reducing private ownership of guns also reduces gun violence.
REALITY: Violent crime rate unrelated to LEGAL guns rises 20%. People previously able to defend themselves with guns are now victims.
Criminals who used to use caution when committing crimes can now be less cautious, because criminals tend to prey on the weak. Without guns, weaker people are now defenseless.
Suicide rates only dropped 1%. Methods used shifted to more asphyxiations and overdoses, the #2 and #3 methods currently employed.
If we could get criminals and the mentally ill to follow the current laws, we wouldn't have anywhere near the "gun violence" we see now. Legal guns are not involved in the majority of gun crimes when you exclude suicides..
I'm at a loss on how you intend to "address these issues" when the
issues have not been properly defined.