Christians celebrate rape, torture, slavery and genocide.

[John V]

Your own verse says that the killer shall be put to death. Is that killing inherently sinful?

It states the penalty for sin. You have to remember, that Jews were still not allowed to take justice into their "own hands", read the full passage and this is clear.

Is it sinful for people to carry out capital punishment ordered by god?

If not, then on what basis do you claim that killing is inherently sinful? And on what basis do you claim that Drich's position (to which you were responding) is incorrect?