You are the one that needs a history lesson!
this started in 1948 as an ethnic and religious separatist insurgency in the historical Malay Patani Region
Although low-level separatist violence had occurred in the region for decades, the campaign escalated with a recrudescence in 2004,
https://peaceresourcecollaborative.org/wp-content/uploads/2020/02/Introduction-Conflict-in-the-Deep-South-of-Thailand-Neverending-Stal.pdf
the above article will tell you the history lesson you need
The tak Bai incident did not help !!