I don't see the issue either. In a fancy job like this it seems much better to get fired now so he can calmly plan his next move, instead of them waiting for him to return and then firing him, which would just waste everyone's time.
That graph, and "social mobility" analysis in general, shows the movement from low income to average. This is good for a country overall, but it's irrelevant to the discussion that people are having in this thread. Most people here are more interested in the median to rich movement. Unfortunately this movement is practically impossible in countries like Sweden and NL (for an employee).
Let's take a typical profile that HN users would be interested in, a top10% engineer working for a big company. This person would never become rich in NL, but almost always become rich in the US.
You can suggest that they write a stern tweet or reddit comment, like everyone else who likes to pretend they're protesting so they can pat themselves on the back and then continue watching the sport.