It's heartbreaking, so sorry. 
When my chickens were killed it took me months to get over it, mainly because I felt I had let them down.
I think electric is the way to go to give them something that bites back. Raccoons are so persistent and if you get a family of them, they will find the weak spot if you have one. I have a camera and they were crawling all over the hardware cloth. I also remember reading, you need 1/2 inch HC because a raccoon has a hard time gripping it vs a wider hole.
I had a raccoon peel off the metal outer layer from my garage door to get inside to get to the chicken food. They are formidable predators.

When my chickens were killed it took me months to get over it, mainly because I felt I had let them down.
I think electric is the way to go to give them something that bites back. Raccoons are so persistent and if you get a family of them, they will find the weak spot if you have one. I have a camera and they were crawling all over the hardware cloth. I also remember reading, you need 1/2 inch HC because a raccoon has a hard time gripping it vs a wider hole.
I had a raccoon peel off the metal outer layer from my garage door to get inside to get to the chicken food. They are formidable predators.