If it helps, I imagine that the Lord of Blades probably saw a lot of bad things happen to Warforged because their makers saw them as "expendable." It's a cliche in and of itself, but its fairly easy to give him a reason behind his madness.

Of course, if I ever made a D&D setting, Warforged would by and large be separated into an extremist sect following that setting's version of the LOB, while most Warforged would live in what amount to monasteries - not so much like the D&D Monk, but more like real monks. They'd still have their own martial arts form, but they'd be less "Arrogant Kung Fu Guy" and more like, I'unno, the Air Nomads from Avatar, but as a genderless race of robots seeking harmony with the earth they were built from.