Yes, PEOPLE are the problem, not the object. I will not disagree at all that guns make the process a bit easier, but the constant in this equation is the person part.
Here is something to think about for a second:
What has changed in this country to cause such an uptick in mass shootings? There have always been guns in this country, heck, a lot of people used to hunt for their own food. Why were there not more mass shootings 30,40, or 50 years ago?
What about school violence? Kids used to bring pocket knives to school all the time and we did not have mass stabbings back in the 20s,30s,40s,50s, or 60s did we?
I think that we, as a society have changed for the worse. We have allowed "freedom" for people to be assholes, and now we are seeing the results.