What is their argument for keeping Block size smaller? Ive never understood this.  

 So people in poorer countries could run full nodes easier. 

 All three questions have the same answer.

Miners.

Which miners the ones who can’t afford to run at a loss.

Which miners are they?

The corporate company miners.

Why does this scare people? 

 Changing the block size has absolutely nothing to do with block time.

Smaller blocks doesn’t mean faster blocks times.
Bigger blocks doesn’t mean slower block times. 

 Right that's difficulty 

 Yes that’s what makes the adjustments to keep ~10 min blocks  as hash rate changes. 

 This makes sense. There is a trade off. It’s not so simple. 

 You think that’s how things work? 

 I was more just trying to understand his point of view.