Math process error

[aussenseiter]

I am looking for the name of the mathematical fallacy being committed here. I saw it on Twitter.

Please note that this is not an invitation to post any of the usual racist horseshit shutup.

On to Oz:

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I have this little inkling of a thought(I'm not that bright, OK?) that comparing the rate of criminality among natives vs the absolute native population is fine, but comparing the rate of criminality among foreigners vs the absolute native population is...I want to call it a rump equation. It's not a cogent math problem to solve. It just tells you the population is much bigger. [You must be logged in to view images. Log in or Register.]

Please note that in the above "vs" does not mean committed against. See second sentence.