The best leaders don't just take responsibility for their job, they take ownership over everything that impacts the mission of your company. Anything that goes wrong on your team or in your company is a result of your failure as a leader. If you tolerate poor performance, poor performance becomes the new standard in your company. Every single team member must be bought into your mission. A leader needs to enforce the standards that they expect, and they need to unite the team together around the standards and the mission.