If there were no leaders, the world would collapse into sheer chaos and anarchy. Crimes are also everywhere.

Now let this sink for a minute, You have a lots of people that do not know what is their purpose in the large scale, but they know perfectly what to do to survive. Know you have a great starting point for anarchy where everybody becomes a single functional unit by all means. He starts to gather resources on his own, he starts to build his property, his defenses, his everything. And once he collide with some other functional unit that needs the same resources, the conflict begins.

Yes there is a possibility for negotiation and for building a society with shared resources and be well. This of course needs a leader that gathers people to pack and give them a purpose at larger scale.

The same principle applies to the workplace. Without a leader at large organization, the work would get done randomly at best. But what is more probable, that work would not be done at all, because at some point You will be dependent on somebody else who would not want to work. Again You need the leader to coordinate and give large scale purpose.