I think that for most, this was a shift from “mildly opposed” to “mildly supportive, and if you’re going to do it, do it now”.

At least my pro/con list hasn’t changed, just the odds. I still think we’re more likely to be dragged into war somewhere far away than being attacked ourselves, and that the US is an unreliable ally. But those are acceptable risks compared to the chance of having the whole NATO having our back if there were to be war on our ground.