If this is a Salafite rebellion, why are they arresting secular Nasserits and communists?

I mean, the Syrian regime is refuting its own propaganda.  All this talk about a Salafite and terrorist threat to Syria, and they arrest people right and left: secular Arab nationalists and communists of different kinds.  No one is spared.  This is a regime that is resorting to Hafidh Al-Asad's style of rule.  There is no progressive or pro-Palestinian argument for this regime, especially when it accepted the Saudi peace plan, and it supports resistance to Israel in Lebanon and Palestine but fiercely prevents it in Syria itself.