That's just as false as those typical complains "why furries are all gay".
I get that you don't like the combination (+ horror), hence you think it's "way too many" - one more of those means you have one less to enjoy.
If fact, the amount is very limited. You can do a search for yourself.
It's OK if you don't understand. But "goregasm" or similar kink is a thing.
I mean, I've been around since they first started coming out. Morenatsu was the first big furry VN in general, but the first big one within the English-speaking furry community was Blackgate. And things kinda followed along with the horror themes of that one with many of the subsequent VNs. One of the few exceptions recently are games like Forbidden Fruit, though that style is already very different from your standard VN.
But you can boil down the vast, vast majority of furry VNs to horror, school life (or school life esque), and the latest big trend of high fantasy.
Here, let's look at the Latest Updates again for Furry Ren'py games.
Identity, this game (horror)
I.C.O. (horror)
After Class (school life)
Deers and Deckards (gets a pass, but essentially school life)
Sileo (school life)
Outland Warrior (fantasy)
Game Over (fantasy, but is unique enough that it can get a potential pass)
Santa Lucia (horror + school life)
Arches (horror)
Extracurricular Activities (school life)
Tavern of Spear (horror)
Shelter (horror)
Killigan's Treasure (mostly fantasy, but gots some horror in there)
Repeat (horror + school life)
Far Beyond the World (mostly fantasy, some horror)
Do you see what I mean? Also, I enjoy plenty of these games, including the horror ones. I love Shelter, for example. But I do wish more furry VNs would explore other themes.