I think it makes sense to feel sympthy towards people facing disruption in their plans, even if you believe society is better off overall.

It's like getting scooped. If you just founded a startup based on tech XYZ, should you be happy when someone releases an open source XYZ? Should a news reporter be happy when another network breaks the story they were working on? On the one hand, society got the value of the thing you wanted to do. On the other hand, now you need to find something else to do, which might be really annoying.