Q.Why Would Anyone Want To Kill Wild Violets?
To me, grass is about one of the most useless plants for a lawn. It provides no food for bees or hummingbirds or butterflies, etc. All across our country we are now seeing pollinators dying out after years of lawns and yards being swamped with pesticides. The sad part is we are getting rid of these “weeds”, just so we can create an artificial form of “beauty”. We need to start looking at our yards from a survival point of view. Lawns are there not just for ourselves but for those small beings upon which our own survival depends. We need our pollinators to increase, not kill them off by removing the plants they feed upon. Instead of killing Wild Violets, plant more flowering ground cover such as Red Clover, White Clover and such, alongside of those Violets. Let the Dandelions grow and multiply since they are the first plants that provide food for emerging bees and other pollinators coming out of hibernation every spring.

Certified GKH Gardening Expert
In order to be fair to everyone, we must include information for grass lawns, as well as alternatives (Which I also prefer).
This will take you to some search results for alternatives to lawn grasses:
https://www.gardeningknowhow.com/search?q=grass%20alternatives