I agree that RTD didn't like Ianto -- and I think what really set him off is that fans were swooning over him (and Jack and him) rather than his own personal Ms. Snow White. I truly believe that's the real reason he killed Ianto -- to get back at fans for not falling in line with loving the witch and to get rid of the competition for Jack's interest.

I can't even begin to tell you how much I hate RTD.