1.6% of U.S. adults are transgender or nonbinary. Also, a rising share of Americans say they know someone who is transgender.
www.pewresearch.org
About 5 percent of adults between the ages of 18 - 29 identify as trans. Robin Westman was 23. The Nashville shooter was also in her 20s.
Some things I notice in your source for this 5 percent claim.
The 5% is not just trans. It's trans plus nonbinary. The trans portion of that is 2 percent and the nonbinary portion is 3 percent. Out of all adults, it's 0.6% trans (notably lower than the 1% reported earlier in this thread) and 1 percent nonbinary.
Also, this is based on people's responses to an anonymous survey. It does not say anything about how people represent themselves in public.
The other part of the survey is about how many people know a trans person. In this part of the survey, only 44% of all adults report that they know any trans people at all. So 56% of adults report that they do not even know one single trans person. Even within the 18-29 age group, only 52 percent report knowing even one trans person.
Consider that.
If a full 2 percent of people ages 18-29 identify as trans in this anonymous survey, how is it possible for a full 48 percent of 18-29-year-olds to report that they don't even know a single trans person. The average person knows easily hundreds of other people.
In order for these survey results to hold, it must be the case that the great majority of these people who identify as trans in their anonymous survey responses are not recognizable as trans to most of the people who know them. Perhaps some of so successfully transitioned that they pass as the opposite sex without anyone questioning it. But I think probably more of them simply go along with public expectations and publicly identify as their biological sex, while privately struggling with identifying as the opposite sex. What they say about how they identify themselves in this anonymous survey doesn't match how they identify themselves to most of the people who know them in their day-to-day lives.
These distinctions about who is being counted as trans and in what context make a big difference when trying to compare the percent of mass shooters who are trans with overall population.
Out of the 297 mass shooters in 2025, how many of them belong to that 0.6% of the adult population who anonymously tell survey takers that they identify with the opposite of their biological sex? We have no way of knowing to total. But we have at least two confirmed cases, which is 0.7% of the total, meaning that even if we could count all 295 of the others as confirmed non-transgender (which we can't, using the same criteria by which it was determined that 0.6% of the population is transgender), it would still mean that transgender people have been over-represented among mass shooters so far in 2025. Since the actual number of transgender mass shooters (again, using the same criteria that is being used to count the percent of the overall population) is surely higher than just the two out-and-proud ones we know about, their over-representation is higher.
And this is without excluding gang-related and drug-related cases.