That doesn't mean that they can't do more de-escalation or take other steps, but the high prevalence of guns does seem like it would be a contributing factor.
(I realize this touches a hot topic (guns) but it's an honest question, and sympathetic to law enforcement.)
Despite the much higher relative levels, the amount of gun violence in the US still isn't all that high in an absolute sense, and police are not particularly the target of it.