Answer :
According to the editorial, it would be a mistake for the US and its allies to stop fighting against terrorism in the Middle East because:
1. The terrorists target not just the actions of the US and its allies but their very identity.
2. There is no safe place to retreat to because the terrorists don't hate what is being done but rather who they are.
3. Ceasing the fight against Islamists in the Middle East could lead to them bringing the battle to the US and its allies' home territories.
4. The editorial highlights the example of the London subway bombings as a consequence of not confronting terrorism proactively in the Middle East.
In conclusion, the editorial emphasizes the importance of continuing the fight against terrorism in the Middle East to prevent further attacks and safeguard the security of the US and its allies.