We all agree that murder is a bad thing. Some of us believe that adultery and fornication are bad things. But, once you've permitted the killing of animals and bacteria, and the killing of human beings in war and self defence and euthanasia; and accepted that people may sometimes choose to commit suicide; then "Thou Shalt Not Murder" turns out to mean "You are not allowed to kill anyone except those people who you are allowed to kill". And even if you agree that the only permissible sexual intercourse is between married people, you can hardly to fail have noticed that society keeps on changing its mind about what counts as "marriage". Cousins are sometimes allowed to marry and sometimes not; the age of legal marriage can be quite young or surprisingly old; societies can't even come to a firm decision about how many husbands and or wives a man and or woman is allowed to keep on the go at once. So "thou shalt not commit adultery" turns out to mean "you are forbidden from having sex with anyone except those people who you are permitted to have sex with": a variation on "you should do whatever you should do".
I came across a person on the interwebs who affected to be genuinely astonished when I suggested that the Christian church, and therefore very possibly the Christian God, approved of some kinds of killing but not others. I said that it would be rather odd for YHWH to give detailed instructions about meat preparation if by "Thou shalt not kill" she had meant "Thou shalt not kill anything, ever, full stop". I said that since YHWH shows no sign of being a pacifist; and seems to think that very naughty people -- witches, for example -- should be executed, she probably things that the killing of one soldier by another solider in a properly declared war, or the killing of a criminal by an executioner after a perfectly fair trail wasn't murder. So there was no necessary inconsistency in being a Christian warrior or a Christian supporter of capital punishment.
But it says "thou shalt not kill" in the BIBLE, he kept saying, and yet these Christians support WARS. Haven't THEY read their own BOOK? HAVEN'T they READ their own book.
("Can you imagine Jesus in any army uniform" is not a very helpful contribution to the debate. I can't imagine Jesus playing cricket, and, come to that, I can't imagine the Queen going to the toilet. A clever person on the interwebs recently remarked that if you can't imagine Jesus with an erection, you a probably really a docetist.)
Some people believe, or pretend to believe, that no-one ever really believed in witches. The whole concept was dreamed up by sad individuals who had a bit of a thing about setting fire to old ladies and needed a flimsy pretext to indulge their rather specialized proclivities. Mrs Thatcher (speaking of witches) used to comically and ludicrously claim that there was no political element behind the campaigns of assassination and bombings by the Irish Republican Army: they blew people up because they were the kind of people who liked blowing things up.
A world of bad people who were bad because they wanted to be bad; where no-one ever does a bad thing for a good reason, or a bad thing for a bad reason which looks like a good reason from their point of view. How nice it would be if life were that simple.
I know: let's pretend it is!