God's glory is like that. Until we see how glorious God is, we always think that we are better than we are. We think that the tiny flick knife of our goodness is effective, until we see God pull out the Bowie knife of his glory. And then we realise that we are wretched, poor, blind, stupid and hopelessly inadequate in our sinful fallen natural self. We come face to face with reality, and what we see scares us.
Reality is scary.
Angels stand in God's presence and reflect his glory. They remind us of our sinfulness. They remind us that God's sheer goodness is like a fire that will devour all evil, including the evil in us. But, these angels are sent to proclaim God's message of salvation. Of favour and peace.