Environment must be safe for dissent and as a leader you must be accepting, even welcoming of criticism and different ideas. As long as these ideas are presented professionally and courteously, you need to accept them with humbleness and give them serious thought and consideration.
After all, be mindful that people on your team and other teams may know a lot more than you do on particular initiatives and as such they certainly deserve your attention, respect and consideration. Communicate, collaborate and work together.