The negative impact from a toxic high-performer isn't a slow burn; it's a hidden liability. A business can appear successful for years before a sudden, catastrophic failure when a few key employees finally quit, causing the entire structure to fall apart.

Keeping a toxic employee is a short-term financial gain that leads to long-term failure. That person will inevitably cap growth or cause a collapse. Leaders must constantly recruit their replacement or identify capable subordinates that the toxic employee is suppressing.

A key source of executive team dysfunction is the "empire builder"—a leader who is skilled at managing up but is ineffective in their role and hard on their team. A strong CEO identifies and removes these individuals quickly to maintain a high-performance culture.

Jane Fraser asserts the most critical step in fixing a culture is removing people who drain energy, regardless of performance. She believes a good person in a bad culture can recover, but a toxic individual remains toxic and demoralizes the entire team.

A kind culture must be actively protected. How a company handles high-performing but unkind employees reveals its true values. Prioritizing cultural integrity by addressing or removing these individuals sends a powerful signal that kindness is non-negotiable, even at a potential short-term cost.

A senior hire was instrumental in getting Snowflake's CRO promoted. Eighteen months later, that same person was found to be 'cancerous to the organization.' The CRO had to fire them and go on an 'apology tour,' a painful but necessary act of leadership to protect the company culture.

Your culture isn't what's on the walls; it's defined by the worst behavior you allow. Firing a high-performing but toxic employee sends a more powerful message about your values than any mission statement. Upholding standards for everyone, especially top talent, is non-negotiable for a strong culture.

A company's culture isn't its mission statement; it's the worst behavior it's willing to accept. High-integrity employees will leave a toxic environment, while transactional, self-serving employees who tolerate anything for a paycheck will stay. This selection process causes a continuous erosion of culture.

Allowing a high-performing but toxic employee to thrive sends a clear message: results matter more than people. A leader's true impact and the company's real culture are defined not by stated principles, but by the worst behavior they are willing to accept.