"... there's one less jihadist in the world."
Sadly I suspect the opposite to be true. I wonder how many undecided teenagers are sitting at their laptops at this minute and wondering what this country thinks of them. They see the white men who went to Syria with the intention of killing who have now returned and are happily hosted by TV and radio stations to talk about who they killed, then they compare that with the disgusting comments people make about Islam in general, never mind the naive girl who volunteered to cook, clean and give birth for what she saw as the Islamic cause.
They might even be dismissive of Shamima Begum herself, but they still wonder why she is reviled while the others are feted. They could even be looking at sites just like this, hearing that the religion they follow is a religion of savagery.
I am no apologist for extremists or for people who bite the hand that feeds them, but if I was a peaceful Moslem teenager hearing Day in, day out that I am a terrorist waiting for my moment of glory, I might even start to believe it.