No right thinking Government should encourage emigration, but the short term benefits end up painting the government in a nice light. Latvia has benefitted greatly from huge emigration and its figures and performance do look good.
Look at what happened the last time. It wasn't just the unwashed masses, it was graduates who were unemployed. So we invest money in educating people and then don't see a return on that investment. We miss out on all the good stuff and taxes they would pay.
But they do come back just when they're towards retirement, they return to live out the rest of their lives in the homeland. So we have to pay for that.