I would think it a lot more likely that newcomers to this country will come to share the aversion of most locals to guns, rather than that locals will start picking up an appetite for gun possession from newcomers, even given that rather questionable assumption that newcomers will have those kinds of attitudes. Which in my experience is not generally the case.

It's very sad that in a very few places illegal gun possession and use has grown in recent years. However the numbers killed in some parts of some of our big cities as a consequence would still count as incredibly low if they were translated to equivalent big cities in some countries where legal gun possession is widespread.