Culture Matters: How Leadership Enables Toxicity And Makes Way for Mediocrity

In “Culture Matters: How Leadership Enables Toxicity and Makes Way for Mediocrity”, AJ Thomas examines the hidden organizational cost of toxic employees and, more importantly, the role leadership plays in allowing toxic behavior to persist. Rather than treating toxicity as an isolated individual problem, the article reframes it as a leadership and cultural failure with measurable consequences for performance, morale, and engagement.

The discussion is grounded in research by Dylan Minor and Michael Housman from the Kellogg School of Management at Northwestern University. Their work finds that roughly one in 20 employees are ultimately fired for toxic behavior and that avoiding toxic hires can save organizations approximately $12,800 per employee in turnover-related costs. These savings can be reinvested into developing high-value contributors rather than managing damage.

While toxic employees clearly impose direct costs, the article argues that leadership bears the greatest responsibility. When leaders fail to act, toxicity becomes normalized, placing a tax on morale, trust, and productivity across teams. Over time, this erosion leads to disengagement and mediocre results—even when short-term performance appears strong.

Based on interviews across high- and low-performing organizations, Thomas identifies three reasons leaders often tolerate toxic behavior.

First, empathy and belief. Leaders may empathize with the individual and rationalize toxic behavior by focusing on the employee’s “unique” skills or perceived value.

Second, performance bias. Toxic employees are often high performers or possess scarce expertise—particularly in sales or engineering—leading leaders to prioritize output over behavior.

Third, outcome over process. Leaders focus on what gets done rather than how it gets done, overlooking how toxic behavior undermines culture, trust, and long-term performance.

The article emphasizes that morale, engagement, and productivity are not “soft” metrics. Leaders who ignore toxic behavior weaken these fundamentals and inadvertently enable mediocrity across the organization.

To counteract this dynamic, the article outlines three concrete actions leaders can take immediately.

First, get the pulse of the organization. Leaders must establish real feedback loops that surface authentic employee perspectives—not just sanitized or filtered views. Multiple channels and a clear framework for interpreting feedback help reveal cultural hot spots and systemic issues.

Second, define and reinforce acceptable behavior. Leaders must be explicit about which behaviors are rewarded, recognized, and tolerated. Clear cultural standards make it easier to identify and address toxic behavior before it spreads.

Third, provide courageous and actionable feedback. Many leaders avoid difficult conversations out of fear of disrupting short-term performance. However, toxic employees are often capable of understanding feedback when it is clearly tied to collective goals and organizational impact.

The article concludes with a clear message: culture is the real lever. Toxic behavior manifests as declining trust, unclear ownership, and falling performance. Leaders must pay attention not only to what teams say—but also to what they avoid saying.

Ultimately, tolerance of toxicity damages leadership credibility and organizational trust. While HR may manage exits, it is leadership’s responsibility to create the conditions for high performance by modeling, reinforcing, and protecting healthy cultural norms. Culture, the article argues, is a team sport—and leaders are its primary stewards.