That is not the gun problem. If you check Europena countires in Europe with highest number og weapons per capita, then you will find that a lot of countries where people do have weapons is safe.
The murder rate in US is higher than the European average, that is true, but most of those rates is from big cities, like Detriot, St. Louis, Baltimore or New orleans. Those cities are in fact on the top 50 list of the worlds highers murder rate per capita. Upon checking the state laws for those cities you will find that there is no correlation between how easy it is to get gun, as some of them have pretty restrictive laws and others do not.
You can read this article from Mises Institute: https://mises.org/blog/theres-no-correlation-between-gun-ownership-mass-shootings-and-murder-rates