People have all kinds of attitudes for all kinds of reasons. Those who doubt the ideas of others may struggle with a pride that doesn’t allow them to endorse any idea that didn’t originate from them. Pride is a tough attribute to overcome and it takes a bold leader to address it on a team. Fear may also cause doubt for those who are inexperienced or simply have their mind made up about the safest path forward. Fear can more easily be mitigated with a confident and consistent vision from the leader.