This is a super bad take. Most invasive species were brought over by Europeans, so yes, they did have an “immigration program”. The reason they’re outcompeting natives is not that they’re fitter, but that they have no place in the ecological systems here: nothing eats them so they have no checks on their spread.
They literally did, though? Europeans brought animals and plants over on their ships—the same ones they were coming over on. Kudzu is an extremely recent example, but invasive species date back to the literal first colonists. The two issues are inextricable.
And it’s not that the plants are fitter, it’s that they have no predators as a result of human activity.
I’m sorry, but I really think this is a “no investigation, no right to speak” scenario. It would take thirty minutes on Google to figure out why you’re wrong.