“they’ll start in on all other Christians soon enough.”
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The RCC is a more target rich environment, due it’s a lax position on homosexuals in it’s clergy and it’s followers.
Fundamentalist/Evangelical churches are most often not as tolerant of such behavior and pastors/staff who have been found to engaging in it are most usually booted out post haste. So, less of a target rich of environment. Even then it’s more individual churches/persons as opposed to denominations involved in the wrongdoing.
A large part of the reason for that is the concerted effort so many groups made to get the Catholic Church to "moderate" back in the late fifties and early sixties leading up to Vatican II. It's easy to see the same sort of push to have all the many denominations of non-Catholics being pressured the same way and just as easy to see that so many of them are quite agreeable to the idea of accepting queers as "just more sinners".
We'll see after another few years of the pressure to "moderate" just how many non-Catholic churches stand up to the negative press and social pressure once the larger ones moderate as they already are. A short while after the smaller churches are abandoned by people prone to going along to get along (as most Americans are) we'll see a plague of scandals involving children and since most pastors are married, all sorts of other carnal accusations.
"Fundamentalist/Evangelical" is a very adaptable category as anyone over about fifty can attest to since tattoos, rock music, premarital sex, and even marijuana use are no longer commonly targeted as sinful behavior or even a "poor testimony" in churches that preached against all of those only a few decades ago. Given the wardrobe selection of women at the churches in my area (Western NC) I'd say modesty isn't much considered these days, either.
Like I said, they'll start in on all others soon enough and they'll have more than enough accusers to make the same sort of headlines we see about Catholic Churches along with a variety of others.
Face facts, if the country as a whole, "Fundamentalist/Evangelicals" included, hadn't turned away from God the country wouldn't be in the shape it's in. If the problem is or was mostly Catholic, then the fact that so many people have left the Catholic Church and become "Fundamentalist/Evangelicals" should have us basking in the glow of God's favor and the land should be flowing with milk and honey rather than in heroin and pornography.