Do we lock people up before they actually commit a crime? What would you call it if we did?
That would be bad. I'm not sure what we'd call it. I don't think being asked to refrain from practices known to spread an unusually lethal contagion, to the greatest possible extent, can be defined as tyranny. Do you have examples of people locked up without committing a crime to discuss?
I do know that when a person, "[in] the doing of a lawful act in a reckless or grossly negligent manner, he causes the death of another person", the Commonwealth of Pennsylvania calls that involuntary manslaughter. You may feel differently. However, if your counter-argument to that can be summarized as "but it's [hard to prove|easy to get away with]", then perhaps your argument is not a good one even without the aggressive contact tracing it'll take to end this.
Unanswered: what medical advice is Free Republic giving you on figuring out who's healthy and who's contagious? Are YOU healthy?