If you witness child abuse and say nothing, you bear some responsibility for its continuation.
If you’re the top health official of the country and spread doubt about numerous public health interventions, including actively suppressing research showing their safety and efficacy, yes, you’re guilty as fuck.
Because an opinion can’t rise to homicide, even if it influences policy. That’s not what homicide is. Instead, it’s simply bad policy, to be punished at the ballot box.