probably because she’s pregnant, it’s really poor form to have john kill his wife while pregnant with his unborn child? like… there’s an unborn child… she’s pregnant… ?????

kinklock:

why does a woman have more value to you when she has a fetus in her than when she doesn’t , just wondering 

I’m sorry, I don’t mean to step in and be rude, but I think what this person is trying to say is that they value the life of the child, and John (and hopefully Sherlock’s) happiness with the child more so than they value Mary’s. Therefore, they simply wish to let the child be born before Mary is killed, so as to allow John to have his child and his family with Sherlock, and not her.