Warning - not completely thought through thought ahead!
Could we say something similar about the unholy Trinity? That God does not keep the sinful world from attacking us, because then we would become easy prey for that beastie, the devil? Or vice versa? God uses devil, world and sinful flesh to drive us to prayer - but perhaps he also uses each one to keep the other two occupied, and keep us safer?
UPDATE: Or maybe it is something along the lines of the Luther quote my bride posted on her facebook page:
The most dangerous trial of all is when there is no trial, when everything
is all right and running smoothly. This is when a man tends to forget God, to
become too independent and put his time of prosperity to a wrong use. (AE44:47)