Sometimes you wonder whether your own philosophical convictions block your ability to fairly evaluate the arguments of others. In my case, my anti-relativism is one such conviction. I find it hard to be sympathetic to arguments for relativism. I try to do my best do be charitable but I know I often fail. I guess I would now want some help in being charitable about Sharon Street’s argument against Realism based on evolution. The argument is in her paper ‘Constructivism about Reasons’ which she presented at Shafer-Landau’s prestigious metaethics workshop (the paper is still available online through pea soup). For me, it just seems obviously fallacious. The same form of argument gives elsewhere a false conclusion from the analogous premises. But, I must be missing something. A small caveat – she says that her goal in the paper is not to argue against realism (even though she does). She does this apparently elsewhere with more success I hope.