They have handed over their sovereignty to US forces to help kill their Muslim brethren. You want them to prove some more loyalty tests?

The state religion in Kuwait is Sunni Islam. It's much more nuanced than "Muslim brethren", except perhaps less so when Israel is directly involved, as it is today.

It's also important to note that these are not democracies. The state frequently does things that people aren't entirely happy with, it's only when the people (or religious leaders!) become sufficiently unhappy that it becomes a problem.

Do not mistake leadership and regular people. Afghanistan president Ghani handed over sovereignty to US too but Afghans disagreed. I am confident that there is significant minority in Kuwait wishing for Iran victory. As a datapoint, there were videos from Bahrain with people cheering for Iranian rockets hitting American bases.

Lol most Kuwaitis including the royal family are Sunni and believe Iranian Shia's to be heretics. So no love lost there at all.

Imagine thinking that you're brothers with someone based solely on what religion you both supposedly believe.