As a founder, I have three levels of responsibility. A responsibility for every individual I hire, which I respect to the maximum I can. On top, a responsibility for the team into which I hire an individual. On top, a responsibility for the company which I am building.
I've lost teams. I will fire any individual who will endanger a team by sabotaging it or not carrying the same weight as the others.
I've lost a company. I fill fire any team who will endanger my current org.
We're releasing two (massive) underperformers. One of which you can hear him playing games in the background on VOIP calls. The other is almost definitely not working - both are closing maybe a single task a month, whereas we "expect" (roughly) four or more.
I've lost teams. I will fire any individual who will endanger a team by sabotaging it or not carrying the same weight as the others.
I've lost a company. I fill fire any team who will endanger my current org.