To quarantine or not?

Del Bigtree has a lengthy video on subject. I haven't watched it all, but saw some very interesting material starting at 58 minutes, and again at 1 hour and 48 minutes.
According to the medical experts he's interviewed, it is far from clear that quarantines are actually effective. According to the political economist he interviewed, the quarantine is not only economically devastating, but, long-term, is also very hazardous to public health.
The overflowing hospitals in Italy, particularly Lombardi, are apparently a chronic condition every flu season. He read an newspaper article from 2018 which sounded exactly like the Coronavirus reporting we've been getting from there in 2020. Italy has the oldest population in Europe, and a high percentage of smokers. I suspect it's all similar in Spain.
According to Swedish medical expert Johan Giesecke, all the quarantining is useless.