Wallahi no one has ever conquered Arabs and no one ever will. I'm talking about the descendants of Ibrahim (AS) who mostly reside in north Arabia. Their forefathers Ibrahim (AS) and Ismail (AS) built the Ka'ba and they (their descendants) were the guardians of it until today. Horta who the heck is Alexander the Great? Remember what happened when Abyssinians tried to attack Mekkah in pre-Islamic Arabia before the prophet (SAW) was born? How did Allah (SWT) deal with them? Allah (SWT) has protected the Arabs. One Qurayshi at the time is worth 10 Alexander the greats, in terms of physical strength, courage, chivalry, etc. Quraysh for example, means 'Shark' and it alludes to their physical strength. Hatred for Arabs and inferiority complex will cripple you.
I agree that they were the worst. I even mentioned this, I don't think you read properly. I said they are the worst of the evil ones and the best of the righteous.