There is lots of evidence that Fairtrade has put small coffee farmers out of business. The trendy moralists only buy Fairtrade products, yet only the big companies can afford the fees to belong to the Fairtrade club.
If we do not draw a line between human and other living beings, should we then get involved when a cat that is not hungry is toying with a mouse?
The Fairtrade example was merely an example. There are of course downsides to the Fairtrade project, and other, newer, more fieldwork-oriented projects seem more promising, but there is also tons of evidence that Fairtrade has, on the whole, helped farmers more than it has harmed them.
I do draw lines between humans and other living beings, but those lines must be based on grounds other than simply belonging to a specific species.
The life of a normal adult human is more valuable than the life of a normal adult pig, but not because one is a human and the other one is a pig. It is so because one is capable of seing himself over time, his range of experiences is wider, and his suffering or death will be deeply felt not only by him, but by other human beings to a greater degree than it is the case for pigs.