Just my two cents on the issue of euthanasia methods...
Just because a particular method may offend someone's sensitive nature doesn't make it "inhumane." Assumptions have been made that the "thumping" was done wrong, but the OP never said anything like, "I had to whack it over and over again" or anything disturbing like that.
A quick, sharp blow to the head will cause instant death. What is inhumane about that? Does the dead rabbit care that it bleeds? I've fed pre-killed rabbits to a burm...purchased from a professional rabbit breeder. All of them had been "thumped" on the head and were bloody to some degree or another.
Are there other methods? Certainly. I'm not advocating one or another. I'm simply saying that just because it can be considered "violent" doesn't mean it's inhumane.