Tyre and Sidon, cities of Phoenicia, were destroyed for many sins, forcibly enslaving God's chosen people of the tribe of Judah and selling them to the Greeks among them, but the ultimate sin of turning against Israel , coveting the land and plotting to overthrow and take it, was their undoing in the eyes of God. Ezekiel prophesied of this. Slavery as a whole was neither condoned nor condemned, as I said. Forcibly enslaving Israelites however was condemned numerous times, from Tyre to Egypt. It wasn't the bondage itself, it was the force used and most importantly who was being forced into bondage, that led to God's wrath. Should you be able to use passages from the Bible itself to dispel the above, I'm all ears, but please be aware that the position you're taking can itself be easily dispelled by the same.I think you confirmed what I said, God destroyed Tyre and Sidon for their trafficking. Obviously there's nothing wrong with trafficking textiles and such, but slaves...no.
God destroyed them for their king believing himself a god and for their plotting to take the land of. Israel first and foremost of the sins of Tyre. The forced bondage of the children of Israel was a big problem, too.
Try reading what's actually written in scripture rather than force-fitting someone else’s interpretation or seeking to reach a conclusion based upon political or worldly concerns outside of it.