The gun laws are not relaxed in the US.
What is wrong with you?
Laws in the US are pretty much equal to ours in regards to buying and ownership. The only difference would be their storage (which ill concede needs to be fixed) and their reason to buy.
Majority of those mass shootings in the US occured due to mental instability in the shooters. ~Your~ evidence even stated it.
As far as I know, there is nothing wrong with me.
Compared to other developed countries, US gun laws are very relaxed. I picked a random state in the US, Utah, and looked up their laws regarding guns. In Utah, you don't need a permit, your gun doesn't need to be registered and you are allowed to own assault weapons....Utah isn't the only state with such relaxed legislation. In Australia, assault weapons are restricted, meaning only collecters can have them and they must be inoperable and properly stored. There is also a long and exhaustive licensing process to get a gun permit. US laws are not "pretty much equal to ours".
"The New York Times has referred to Australia's gun laws as a "road map" for the US, saying that "in the 18 years before the law, Australia suffered 13 mass shootings - but not one in the 14 years after the law took full effect." ABC news
"Experts from the Harvard School of Public Health, using data from 26 developed countries, have shown that wherever there are more firearms, there are more homicides. In the case of the United States, exponentially more: the American murder rate is roughly 15 times that of other wealthy countries, which have much tougher laws controlling private ownership of guns." New York Times
And yes, my source did say that many of the shootings occured because of mentally instable people, who legally obtained guns. Stricter laws may have prevented them getting their hands on a gun.