I’m quite happy to stipulate that mortal sin happens frequently, if you’re talking about objective mortal sin, AKA grave matter.
But the question you ask has required assessment not only of objective acts, but of the intend and knowledge of those commiting such acts. This is beyond my capabilities, and I strongly suggest beyond yours and others too.
As for the idea that the gospels describe mortal sin as a common occurence, this is untrue. The terms itself appears only later in the first epistle of John, describing a “sin that leads to death”. The gospels and the epistles rightly warn of many sins that would lead one to hell, but that’s different from saying that they imply such sins are frequent or done with the intent/knowledge neccessary for condemnation.
You mention hell. I’d suggest that speculation about the frequency of subjective/personal mortal sin is about as useful as speculation about the number of souls in hell. We have sufficient warnings regarding both, but no specifics. No doubt you might quote to me something like “wide is the road that leads to death”, but we really don’t know how to interpret that (whether it implies that hell is heavily occupied) and the Church has never made any attempt to do so.