>Yeah a minority of romans and greeks had blonde hair
By the 3rd century the name Flavius is among the most common. As we have previously agreed, it literally means blonde. So yes, the entire aristocratic class is or related to someone or at least knows someone who is blonde- it was extremely common. At some point we have to admit that northern Europe was a nexus of culture, and that it spreads south. IE did not come from the Levant or Turkey or Mesopotamia.

Yes, there was also art of slaves in Rome, and they're not wearing shackles because the Romans don't dress their slaves up in loin clothes like it's the American south. Again, all linguistic and direct evidence suggests that Romans came out of the Celtic super-culture. Latin itself is a Celtic language.