There is a serious flaw in the way schools teach people about propaganda, that leaves people believing that propaganda is synonymous with lying, and if a claim is factual then it isn't propaganda. Propaganda is any communication that is calculated to further an agenda. Propaganda uses truth, lies, everything in-between, and everything else (claims that don't lay on the truth-lie continuum at all; e.g. subjective values.)
That definition would forbid any kind of "call to action" communication, would it?
Debates are all and good, but at some point, a decision has to be reached. Especially for a problem like the current pandemic, this unfortunately involves calls for every individual to radically change their behaviour. That fits the definition of "agenda" pretty well.
So if any "any communication that is calculated to further an agenda" is forbidden, how would you fight the pandemic?