MSN says the theory as to why mass shootings are so rare indicates they are searching for the "Holy Grail" of causation.
There is no single variable, as we on here (most of us) agree.
Comparing the US to the Philippines means we need to look at everything, not just the nuclear family constructs. While that makes a big difference in ALL aspects of our values, we also have to look at other factors.
Is the level of prescribed psychotropic drugs the same? Are they more concerned with individually preferred pronouns, teaching trans and Gay culture to small children, and aborting more babies than they allow to be born?
Society here creates so much self-induced stress, pressure and confusion, it's a wonder we haven't all gone insane. Man is woman, White is bad, Immigration is a free-for-all, the economy is being run by a bunch of megalomaniacs who used a pandemic to grab power using illegal means, etc, etc.
At some point, we'll be faced with a law that doesn't allow terminally ill people to own guns. Nothing more dangerous than someone with nothing to lose.

As it stands, we have people fighting, looting, burning buildings and executing people over a single police shooting of someone breaking the law. Where is the sanity in that? Meanwhile, Black on Black crime rarely makes the local news.
As the article stated, there's a sharp contrast between the number of mass shootings and other types. I wish they'd done their research and reported that there's little difference between them and the US in that regard. They have 112.5M people, but the US has 332.7M. So, we have nearly 300 times their population. Think about that statistic when trying to compare the US to other countries.
In reality, the US is a collection of independent states. Each state is a nation in and of itself. That's one reason trying to enact Federal laws to solve any problem is itself problematic. Maybe comparing the Philippines to a large or similarly geographically situated state with over a million residents makes more sense, such as Hawaii. Mass shootings between THOSE entities puts the Philippines way ahead of Hawaii.
Anyway, I think "theories" comparing two countries without making the effort to be more "apples to apples" are a bunch of "thought experiments."