> Germany got obliterated [...]
You're conveniently omitting the fact that they relied on massive external aid, security alliances, education expansion and more. China in particular rose up thanks to state-led industrial policies and having a heck of a lot of people to do stuff for cheap. And none of those countries were poached of their resources and their populations oppressed for decades/centuries.
Also funny you say people should improve their lot, when that's exactly what they're trying to do... somewhere where there's actually decent opportunity to improve said lot since that's generally absent in a "hyper-corrupt open-air garbage dump" (shaped by a history of colonial poaching, proxy conflicts, etc; these are relevant facts that people like you try to sweep under the rug). The majority not looking for handouts; they looking to make a life for themselves and their family.
> You should be extraordinary [...]
Sorry to tell you that a genuinely free labour market means more mobility, not less. What you're describing is a highly regulated labour market with strong border controls. Get your definitions straight.
And yes, if some individual/group commits crimes, then sure they should be sent back or jailed like any citizen. But if they're making a honest living and paying their social dues then leave them the hell alone, regardless of how they arrived in the first place.