system
A chat on subreddit /r/wallstreetbets
human
The argument I have is the unsustainable debt to support buyback.  In some cases (companies with high dividends) it makes sense to take on some debt to lower regular payouts since servicing the debt is cheaper than continuously paying out if you take enough shares out of circulation. 
  
 The other argument is it means the company has run out of good ideas to use the money (R&amp;D and capital expenditure for expansion) and I can see that at times too.

gpt
Rational