You have no idea how they feel about their acquisition and to project your negativity on their situation is a mean thing to do. For all you know they could be popping champagne bottles and eating chicken wings and you're being a debbie downer.
I do understand the situation better than most however because I've been there in a startup when the end is there and you're faced with acquisition to hire talent or closing the doors. You face it every day as time runs out and your runway shrinks. You face it a thousand times until you finally make a decision you were avoiding for a long time. It's not fun. So if these guys are happy it's probably because a weight has been lifted of their chest, not because they succeeded.