I tend to have the opinion that guns as objects aren’t the problem, but they are the last things you want in the hands of people in a society where there is clearly a desire to commit mass murder on a regular basis.
I'd suggest it's the reverse, or maybe the inverse[?] of what you said (which doesn't invalidate it), that being:
I believe there's a non-trivial amount of innate anger, violence, in our species, look at the knife attacks in your neck of the woods - and to be very clear: that just to illustrate that conflict exists and human beings can be violent, but more to your point, by giving them easy access to a much more lethal mechanism, it significantly compounds the issue.
I'd also say this:
There's an underlying "gun culture" in the US, it reinforces guns as a response, that guns empower you to take action, they provide a false sense of control that leads to be people being more confrontational. So many gun owners fetishize their firearms, they love boasting about their collections, displaying them, talking about them - as a matter of wanting one for defense and quietly owning it, sure, I myself am an owner.
I've seen a number of PhDs in the psych space speak on the matter, and they believe there's a sort of "violence empowerment" with gun ownership - when people carp about, "Well, cars or knifes can kill people" those mechanisms don't motivate, because they have a purpose that's not about killing, they're ultitiarian, or transportation. For the sick individuals that needs that extra push to do something horrific, guns are a conduit to thinking that killing/violence is the solution (beyond just the simple mechanics of how lethal a single person is with an automatic firearm).