[tophat9000]

In a universe of blind physical forces and genetic replication, some people are going to get hurt, other people are going to get lucky, and you won’t find any rhyme or reason in it, nor any justice. The universe we observe has precisely the properties we should expect if there is, at bottom, no design, no purpose, no evil and no good, nothing but blind pitiless indifference.

question

how is that statement a “rational” concept ?

The statement is saying there is no “reason” for our existence

That ultimately the universe is irrational in conception fundamentals saying there is no reason for our existence

he's reason to come to an end conclusion that there is no reason....it all starts with a serendipitous illogical event that just occurs for no reason....

you can't have it both ways

[Heartlander]

Yes, I do believe ‘he’s done thunk himself stupid’.