Well, lets do some maths.
We have already discussed that an estimated 1,839,266 illegal immigrants through May YTD were not apprehended by the CBP.
Also, we previously discussed that Delta was in Mexico much earlier than you thought.
Delta has an R0 of a range from 5 - 9. So, lets call it 7.
I read yesterday that 20% of the illegal immigrants that are apprehended are covid positive.
1,839,266 x .2 = 367,853
367,853 x 7 = 2,574,972
So, the illegal immigrants that were not apprehended have infected an estimated 2,574,972 people in the US. Due to the Delta having a R0 of 7, that number would exponentially grow really quickly.
In your opinion, that has not contributed at all to the current spread of delta? Really?
So, you are arguing that the delta variant is not contagious at all and that delta has an R0 = 0?