> I got downvoted for saying that maybe it's time to treat serious ransomware attacks (infrastructure, security, health, etc.) as terrorism - as in the sense that they're a threat to the national security. But this kinda shows the response I was referencing to.

Terrorism has a legal definition, and something affecting national security is not the determining factor in calling something terrorism.

"Terrorism includes the unlawful use of force and violence against persons or property to intimidate or coerce a government, the civilian population, or any segment thereof, in furtherance of political or social objectives." [1]

[1] https://www.law.cornell.edu/cfr/text/28/0.85