Depends what they’re doing, I know people doing physics and biochem research in Europe because the funding simply wasn’t available in the US.
And better to be somewhere where you can be comfortable without putting forth extraordinary effort, because it’s a big fucking waste of life to be always rooting and hogging.
Having a government that takes care of things like health insurance, education, working hour negotiation, etc from cradle to grave is actually a big time-saver.