Earlier quoted context omitted.
Because European governments take a lot more out of your salary before it reaches you in exchange for social services (pensions, healthcare, etc). Unlike America where you are expected to either drop a stack of bills just to see the doctor or die in the streets.
In almost all European cities except for London (where the cost of living compensates for the disparity, anyway), you're lucky if you're making EUR 70k per year as a senior developer. From what I've heard in the US a senior developer in a comparable location, i.e. West Coast/East Coast makes at least $ 100k per year. On top of that, many American software companies give out stock, which almost no European companies d…
If for any unfortunate reason you are not able to land a decent-payed job, the situation in Europe is much, much better.
So yes, top workers life Software Engineers may earn less. But the safety net for the whole population is way better in Europe.