I take it that you just jumped into the middle of the thread, and didn’t bother to see the context or the discussion that had been made before you came in and started telling us that we were wrong.
I mean, things were pretty interesting and congenial, playing with different scenarios and possibilities before you came in and started declaring that you were the only one with the right answer.
For the record, I am claiming that xenophobic alien civs probably do not exist, and our continued existence is proof of that. The argument that you seem to be making is that there are logical or technological reasons why they cannot exist, and you have done nothing to back your position, other than to make the unsubstantiated claim that everyone else is wrong.
The possibility that this exchange turns productive or interesting is slightly less than being wiped out by a space laser in the next 5 minutes.