Would NATO intervene if Putin triggers article 5 by invading a NATO country

No doubt about it.

If Trump is the president, he would help Putin.

and let Putin have his Soviet Union back.

Pres. Biden has made that crystal clear in the bluntest terms possible without resorting to profanity.

But I think the intervention should be now. All these resolutions, sanctions, etc., are not saving Ukranians. Putin is not going to stop. How high do we set the civilian body count?

Putin's 40 mile long convoy would be wiped out.

The US also indicated not doing so with the war in Ukraine.

Absent something extraordinary, which I cannot imagine, of course NATO will collectively defend a NATO member from attack.

Of course there will "be some advocating for not doing so," if by that you mean citizens and probably even politicians. There are Russians protesting the invasion. There were millions of Americans who protested the invasion of Iraq. Those protests had (and, so far as the present invasion is concerned, are having) no effect.

So I'm not quite sure what you're really asking with your compound question. If you're asking whether some single NATO member has veto power over NATO action, I'm pretty sure the answer is no.

For example in 1994 we (United States) along with Russia and Britain signed an agreement with Ukraine that we would guarantee their security if they gave up their nuclear weapons post ussr breakup. They did and yet we are where we are today.

I hope NATO has enough resolve that it does not happen.

And it really makes a difference.

and I'm hoping that Putin does not try to test NATO's resolve.

And Russia knows it.

There's no question - YES we would intervene and so would every other NATO country. That's why we have a NATO alliance - for mutual defense. If any NATO country gets attacked we are all pledged to come to their defense.

Failure to do so would void the warrantee.

When one is attacked, we're all attacked. It's there as a deterrent but means absolutely nothing if we're not prepared to act once a violation occurs.

Yes, it could trigger something far more devastating. But that's where we are.

Putin's only card if he draws outside the lines? Global annihilation.

Do we have enough resolve to act if article 5 is triggered ? I know it was announced forcefully but it would not be the first time treaties are broken.
As it stands it's up to Putin to decide if he wants to escalate by attacking a NATO country. I hope he has not made the calculation NATO would chicken out.

Although he's had a comeuppance with Ukraine's fearless, defiant resistance. The best we can hope for is that Putin finds an off-ramp or that his own people demand a cessation. Before he turns Ukraine to dust, that is, or flails around with a retaliatory strike against one of the NATO border countries.

True too that treaties have been broken throughout history but this one either stands or the Western Alliance falls apart.

Of course, if he were to go nuclear we all fall apart.

It's a punishing box for everyone. No easy answers but I'm certainly grateful we have sound minds in DC.