In response to 1, that is certainly true, but those countries would fight for their nations unlike these guys who literally wouldn’t. No amount of 4xtra time would save that situation.
2 is your best reason and that is a real concern. We will now have to stop them from outside the country or be ready to go back in and pulverize them. The taliturbans may have gotten the message on that and may want to avoid the risk of us coming back. Time will tell.
3 was gonna happen no matter when we left and we would have to keep funneling war material in there as well as the continuing human cost of combat deaths.
4 is sad but their army should have thought of that before they just gave up.
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