Should BLM be considered as a domestic terrorist organization?

Not before they threaten to kill random people if its demands aren't met

Given they commit acts of domestic terrorism, that label seems appropriate.  

No. Because they do not threaten violence. A small number of them break things, but they, as a unified group, advocated peaceful marches.

This is unlike what the leaders of the Proud Boys did, for instance.

Yes, absolutely.  They threaten violence and commit violence if government policy is not changed to their liking. 

Of course.............