Earlier quoted context omitted.
I don't disagree with your theme, but I think in this case it has less to do with the grenades Trump is randomly exploding and more to do with the E-7 simply being the wrong solution.
In the past it was useful for nations to opt for an American solution even if it wasn’t the most optimal precisely because of America being a dependable and trustworthy ally.
Now that no more protection is offered, there's no point in spending the money.