Wow, this is like the country level of justifying staying with an abuser. If the USA is unreliable and insecure, because of trumps, but more because the American people voted him in and their government sees fit not to prevent the kind of issues he’s causing. Then it’s better to leave and face consequences, and retaliate appropriately now, than suffer and still face those same consequences later.
Yes, but you’re discounting the fact that all intelligence is shared in the mean time. All large intergovernmental organisations are complex. The USA is likely compromised. Sharing data with them would undermine the new entity.