
I would actually argue the other way around. Stealth is inherently a passive defensive technology. It's primary purpose is to protect the aircraft (or ship or tank or grunt in his camo). Now this defensive advantage can easily be used for offense (sneak in and bomb, setup an aerial ambush or make locking on by enemy missiles harder).
Previously the primary protection used to be either superior mobility (hit and run before being hit back) or superior damage resistance (armoring, redundant systems etc). Stealth is just another element of protection - avoid being hit at all.
And stealth isnt something revolutionarily new - low observability has always been a military factor in the form of camoflague, emission control, acoustic damping etc with partial radar transparency being the new hotness now.
Always try to do things in chronological order; it's less confusing that way.