You can't "take care homes out of the equation" - there's no easy way to control infections in them that isn't also a way of controlling infections across all of society. The idea you could isolate specific parts of the community and have everyone else develop herd immunity was a speculative suggestion which is now looking more and more naive with each passing day, it wasn't based on a specific epidemiological gameplan.
And the reason it's important to recognise that Sweden's people have increasingly acted as if under lockdown, regardless of official policy, is because it completely blows apart the idea that the choice is between "reopening the economy" and "lockdown". People will autonomously, in huge numbers, refuse to engage in normal behaviour during pandemic conditions, regardless of whether you force stores and businesses to open again, and it'll still crash the economy - but you'll have even more dead people (and people left with serious, even lifelong, health conditions) in the process.
