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These Creatures Bearly know how to use fire and tools. Because they seek a strong leader then they must be weak-minded.
They fear each other and anyone stronger. Their Tribal structure isn't good enough to have their own leader.  

1st Edition Orc Description from Monster Manual one. 

Orc 1 1-6 7 90 CE D Attacks at -1 in sun Tribal, hostile 1-10

Orc tribes are fiercely competitive, and when they meet it is 75% likely that

they will fight each other unless a strong leader (such as a wizard, or evil priest, evil lord) with sufficient force behind him is on hand to control.

2ed Edition Orc