Arabic dialects of the Maghreb

The events that led to the conquest of northern Africa by Arabs took place what, 1000+ years ago? You can hardly argue that "Arabs are colonialists" in modern times by judging 1000+ years old historical events, in the same way you probably wouldn't judge modern Greek people as colonialists because they speak an Indo-European language and Indo-European languages are spoken all over the continent of Europe and much beyond.