Maybe people aren't having their ideas ignored in Europe. Maybe they're afraid to leave because there are inadequate social safety nets (wait). Maybe European ideas suck? Maybe it's too hard to start a business so lots of people don't; or they have an easier time leaving the country and starting a business in the US (which we'll call American success, even if it's founded and built by immigrants).
Anyway, if that path was more feasible, businesses would need to pay more to encourage people to stay instead of going alone.