And why on earth would you do that?
For one thing, if he has an incentive to lie it would be in the opposite direction. Favourable scaling characteristics for the main chain weakens the scalability argument for sidechains.
Also, it makes intuitive sense.
Suppose you're a node with 8 peers. Each of your peers has 8 peers, until one of them adds two more.
To what extent has the fact that one of your peers added more peers of their own increased your costs?
What (or who) got you to turn?
I'm not sure what you mean by "turn".
Check my post history - I've been in favor of scaling Bitcoin to high transaction rates since at least 2012.