" I don't think this is a fair comparison because we breed these animals for farming, so technically we could breed as many as we need to sustain our habits."

They still suffer greatly. Maybe a little extreme but by the same logic we could breed humans for slavery and say that it's OK because they got bred for it.

"commercial farming of whales will cause the extinction of whales. "

Not if done with proper quotas. It's not different from any other type of fishing.

Again, I don't even eat meat, but we should be a little more rational.