Hi, @Vidqun🙂...
"Why would the locust-scorpions attack religious institutions, starting with the Bethels? They don't distinguish the religious or non-religious."
Locusts are hungry and "fleshly". The religious institutions have amassed wealth. It is the physical, visible wealth of the different religious institutions that the locusts will attack, similar to what the locusts in Joel attacked. As far as the JWborg is concerned, that would mean real estate holdings, investments, the Bethels, the KHs, etc.
"The only ones that's exempt are those with God's seal (Rev. 9:4)."
Ezekiel also talks about those who are marked for survival. Ezekiel chapters 8 and 9 describes some nasty things going on among those who claim to be God's Name people. In Ezekiel 9:4 Jehovah says, “Go through the city, through Jerusalem, and put a mark on the foreheads of the men who are sighing and groaning over all the detestable things that are being done in the city." This marking is not about surviving Armageddon. It's not talking about among the nations. It's specific. It's about those among God's Name people who are disturbed by the nasty false religious stuff and the hypocritical reproachful conduct of those who claim to be also worshippers of Jehovah.