Early Muslims faced persecution on their city of Mecca. why do you think this is?

As Islam spread in Mecca, the ruling tribes began to oppose Muhammad's preaching and his condemnation of idolatry. The Quraysh tribe controlled the Kaaba and drew their religious and political power from its polytheistic shrines, so they began to persecute the Muslims and many of Muhammad's followers became martyrs.

Democracy and darwinism would be my answer.