Liberal propaganda proving nationalist points

I have been seeing leftists and multiculturalists make arguments for mass immigration into the USA with memes and cartoons like the one posted below.
Showing a photograph or illustration of native american with lines like " stop mass immigration? good point lets start with you"
Asserting that white european christians moving into the americas was detrimental to the native populations that were here prior.
Well they are right mass immigration was harmful to the culture and lives of the tribes that were residing here.
The left is right but are they too damn thick to see that they are proving that nationalists concerns are valid?
When a nation is overwhelmed by another nation then their health, safety and cultural future is at risk.
Thank you for agreeing with nationalists and driving the point home!
By the way the native americans they post in these photos did not sit idly by as these mass migrations came trucking in.
They fought with fury and mass bloodshed.
Do they not see they are only encouraging nationalists and disproving their multiculturalist drivel of " cultural enrichment"
What they think they are doing is guilting us but yet again they fail.