"Our product is stupid and probably won't sell despite the mountains of bullshit I've spewed over the last couple of years and we need to pivot so ...."
"We took out some huge debt and need to pay it off asap so ...."
"I made a strategic mistake, so ...."
"I'm hoping to get a huge rise in the stock price and make money off it somehow so ...."
I'm just joking but I think the point is that the smug person doing the firing wants to make themselves look good rather than bad and HAS to try to make the company look good to shareholders even if it's not.