It's an important part that this isn't a genuine concern, it's 100% manufactured by the populist for their own benefit. Boris Johnson and Nigel Farage, two populists, are both very much part of the "elite" they claim to rage against.
It's also important that this is done specifically to cause social problems they can exploit. They have no intention of actually fixing the problem they "identify" and will continue to blame new "elite" groups to obtain or maintain power.