Dude. That is a two line Reddit comment, out of context and incomprehensible in regard to the present discussion. It’s clear why you only included the link but didn’t copy/paste the part to which you were pointing. This is what you linked to:

I know they have been brought into other countries in the past. How has that gone?

Two examples:

Jordan: Black September (Arabic: أيلول الأسود Aylūl al-ʾAswad), also known as the Jordanian Civil War, was an armed conflict between Jordan, led by King Hussein, and the Palestine Liberation Organization (PLO), led by chairman Yasser Arafat

Lebanon: The Lebanese Civil War (Arabic: الحرب الأهلية اللبنانية, romanized: Al-Ḥarb al-Ahliyyah al-Libnāniyyah) was a multifaceted armed conflict that took place from 1975 to 1990. It resulted in an estimated 120,000 fatalities. Fighting between Maronite-Christian and Palestinian forces (mainly from the Palestine Liberation Organization) began in 1975; leftist, Muslim, and pan-Arabist Lebanese groups formed an alliance with the Palestinians in Lebanon.

That’s it. That’s all there is. No prior context, no explanation. There might be if I decided to hunt down the preceding comment, but low effort deserves low effort. Complete waste of time.

Posting it here so no one else falls for it.