Why every manager cannot be a leader?

A leader puts team first and thinks through impact of decisions....
A leader does not shy away from taking tough decisions
A leader works with stewardship...long term impact rather than short-term gain
A leader shares personal viewpoint and not organizational spiel
A leader puts his own insecurity / fear / disappointment behind quickly and thinks how he can help the team overcome this tough situation

Being a leader is tough during the times we are in, but as someone rightly said "tough times clear the grey lines between leadership and management"