You can only use that trick so much. The island I live on (Australia) has a population of 25.6 million (1/13th) of the USA yet also seems to get on the fine with no school shootings (and very restricted gun ownership)
I'm not trying to use a trick. It's just pointless to compare Iceland to a country that's three orders of magnitude bigger. Lots of bad things and lots of good things happen in the US that don't happen there. Places like Australia or Germany or Mexico could be more reasonably compared to the US.
And the guy who replied to you is saying the same thing as in Iceland and Australia restrictive gun laws to outlawing them and school shootings aren't happening in either place. That says something ..America isn't doing the right thing cause those with the most money and their conflicting views rule over stopping the insanity that almost everyone in Iceland I spoke to said America is scary place cause of our guns/school shootings. I now agree yet before putting mysejf in another culture didn't care too much that's just how it was here to me previously.
This video from American idol where a contestant went thru a school shooting further hits home for me ..school shootings are a pathetic part of American life https://www.youtube.com/watch?v=Slhz5ZM2x94&t=310s
I promise you it's very easy to find sub-400k person communities in the US that have never had one either.