They don't. Just the ones you hear most about do. Casual games are by far the biggest market, so those are the ones you hear about. Spiderweb aren't making cartoon bunny games. Positech aren't making cartoon bunny games. Dave Gilbert's adventure The Shivah is hardly mainstream cutesy bunny.
I've seen some spectacularly "unsafe" themes too, none of which I'm going to link to as they're pretty bad taste.
You aren't going to see hardcore mainstream indie games in great numbers, because hardcore mainstream gamers don't play them. The kinda guy who buys a $3k rig to play Quake 5 isn't likely to think much of an Indie FPS, even if it's pretty good.
But yeah, plenty of niche and genre games out there, if you look around.
I've seen some spectacularly "unsafe" themes too, none of which I'm going to link to as they're pretty bad taste.
You aren't going to see hardcore mainstream indie games in great numbers, because hardcore mainstream gamers don't play them. The kinda guy who buys a $3k rig to play Quake 5 isn't likely to think much of an Indie FPS, even if it's pretty good.
But yeah, plenty of niche and genre games out there, if you look around.