Maybe we should sign our DNA / mRNA to defend us against virus attacks. But we then have to protect our nulcei against malicious root certificates. Maybe we will also have to encrypt out code, so that viruses and other attacker will have a hard time. But how do we swap a corrupted root key? How do we increase the entropy when our key is not secure enough anymore? And how much energy is consumed for all the crypto?
Never forget to refresh your certificates or your body will DoS on you.