The only reason we did this is to avoid overwhelming our medical facilities by "stretching" the curve over a longer period time. People are still going to get sick, just not all at the same time.
What Sweden did reminds me of when I was 6. A friend from school got the Chicken Pox. That weekend, a couple of us went to his house and had a sleepover. Why? So that we got it, and got it out of the way (one of us that were there to this day has never had the Chicken Pox, even though he was obviously exposed just like the rest of us). It was normal for people to do that, and in the area there would be news reports of a big spike in Chicken Pox cases for about two weeks...then...nothing. You don't see/hear about people doing that anymore because there is now a vaccine for Chicken Pox.