Not about Apple's profits, not an objection to being able to return what you paid for. Read the thread if you'd like to know what people are actually talking about.
Reasons I've seen so far skimming the thread (not gonna read in depth because I don't care)
1. People upset they have to wait longer for their laptop (not my problem, I'm spending a lot of money too and want to buy the right product for me. Returning a single laptop out of the tens of thousands or hundreds of thousands of identical units being produced and shipped isn't going to slow down someone else's order)
2. Climate reasons (blip on the radar, meaningless self indulgent concern directed at the wrong people)
3. Vague definitions of "it's immoral" (???) unless you're buying a returning a laptop every 14 days so effectively get a laptop for 'free' indefinitely (nobody in the real world is doing this) then I can't fathom how returning something can be considered immoral. If you're worried about Apple's economics and the cost Apple has to endure to restock then you're delusional.