I would still buy it. You did not take away the house from them, so karma is not involved. The house, has been taken away, regardless of whether you buy it or not. It might sound cold hearted, but if you look at the situation objectively, you know that you aren’t to blame for anything. When a house is repossessed, it’s meant to be sold, the people who had to leave the house know that. I think things would be different if you were good friends with the previous owners. That would make things awkward. But if that isn’t the case, and the deal is good and the house looks like a good investment, i say go for it !