I don’t know about the right attitude but I suppose it’s a healthier attitude.
Personally I hope it kills him relatively fast but causes tremendous pain and suffering for as long as possible and he has to use up all his wealth fighting it, dying in debt and painkiller withdrawal.
He’s a genuinely horrible human being and I feel no shame wishing him ill.
If I ran into him on his deathbed at a hospital, I would spit in his face.
I sincerely hope he suffers as much as possible before death. If only there was some way to spread his disease to his loved ones so he could die with knowledge that they will suffer the same fate.