deciding against cryonics [..] causes pain and grief for the survivors

I don't expect that my friends and loved ones will experience less pain and grief when I stop breathing, talking, thinking, etc. if my brain has been cryopreserved against a possible future when its information-theoretical content can be extracted and those functions re-enabled, than if it hasn't been.

So if my deciding against cryonics is selfish, it is not for this reason.