Europe just does not want to realize it yet, but their entire existence is in danger right now
Given what Ukraine is managing to get past Russian air defences, do you think Putin is going to nuke Europe and risk French nukes hitting Moscow and Petrograd? Europe's at war, sure, but talk of an existential threat needs some serious justification.
In normal times, Iran's attacks on European nations would muster an article 5 reprisal
What attacks on European nations? Cyprus isn't a NATO member; if you're counting Turkey as European then it would have to invoke Article 5. Has it? And the fact that all three or four missiles were shot down with the aid of NATO allies would suggest that the spirit of joint self-defence is satisfied. For every member state to send a missile back would be disproportionate escalation.