I don't believe that the security of a payment system has to do anything with its market value.
I think that this is the central point of our disagreement.
I think that its security is one of the important features of the system, and all its features combined contribute greatly to its market value.
But I know that people cannot (and don't have to) agree on everything, so it's fine

But, my thoughts are that this is a minority of mining farms.
The numbers posted by @hosseinimr93 (thank you!) show that it's not a minority.
So you are missing something in your logic. I can't tell clearly what though.
I am aware though that what I was saying is more "empirical" than based on clear numbers, so also far from perfect.