The problem is only partially age.
For overall mass shootings — not just school shootings — academic studies have found that about a quarter of shooters were younger than 25. Almost all were male.
A large-scale RAND study found that 26% of mass public shooters between 1976 and 2018 were younger than age 25. Another study from the University of Alabama found that 27.2% were younger than 25, and that 6.8% were younger than 18.
US Population in that age group in 2020, 15-24 years: 12.91% (male 21,931,368/female 21,006,463).
The guy who killed 59 and injured around 500 in Vegas was 64 I believe.
Another issue is the definition itself. Some say 3 or more killed, some say four or more killed, some say 3 or more injured or killed, etc. With the criteria the politicians and media on the left like to use, 3 or more injured or killed, a guy comes home and finds his wife in bed with somebody else, kills them both and himself, that's a mass shooting. Domestic violence cases like that, along with gang related, happen the most.
With all of that being said, we can do much better if the far left and the far right were both banned from being part of the process. The 80% in the middle could probably make this extremely better in a short period of time.
As for Texas, allowing concealed carry by anyone; no background check, no permit, absolutely nothing required sure seems nuts to me. But it would not have made a difference in this case.
The latest on the door is that now that it was blocked it open when the teacher went outside to do something but closed when they returned. But that they forgot to lock it. Again, makes no sense. If it needed to be blocked open so they wouldn't be locked out, why wouldn't it be automatically locked when they returned?
