Sorry to hear about your kitten
Sometimes it's best to euthanise, but it doesn't make it any less painful.
Some people find it overreacting or whatever to grieve for a pet, well, that is their way, good thing no one is the same.
As for me, my pets are my best friends, they don't stab me in the back, they are true, and I bonded with them since day one when I first saw them, they deserve to be grieved over.
I can understand that's how it was for you too with Lenore.

Maybe after a while you can think, there is now a spot open in our house...Lenore would want it to be taken by a kitten who also needs a good home :-)