Your insight about depression as the disease you'll want to eradicate from this world, truly this disease I mean depression is heart disease that makes people to be sad always. Death of love one or violence is one cause of depression that let me just say it affect everyone in this world, it might not be very worst or suffer people very physically but mind you, it's a slow killer. I wish we could the humans can eradicate this disease fully and make the world a better place.

In the context where you said that God is the owner of disease and it gives to anyone or heal anyone, I can't agree with you, God doesn't own any disease or give disease to anyone, the Bible said it clear that "God is love," how can a lovely God suffer people with disease, think about it.