Um...you're not making a lot of sense. Okay, tell people to stay inside. And then...picture one member of each family is already infected? Why? That seldom happens. How about picture space aliens landing and injecting covid into human specimens. I can picture lots of "convenient" things.
Countries that had effective lockdowns had lower rates of death. Bottom line is you think the tradeoff wasn't worth it -- people dying isn't worse than hurting businesses and inconveniencing citizens. Some will agree with you. Others say we should do everything we can to save lives. That's the argument fault line, that's the point of contention. How much collateral damage is acceptable?