It would be one thing if there was a clear policy and adherence to it. In that case, you could discuss and reason in good faith. However there is no such indication that this decision is based on a considered policy.
Trump's supporters would say that this is a result of not wanting the US being involved in foreign conflicts. That is a laudable goal, however that is not what is happening here. From the article
> On Friday, the administration said it was sending Israel nearly $3 billion in new weapons, including more than 35,000 new 2,000 pound bombs, invoking an emergency rule under U.S. arms control laws.
This just makes it look like a petty tantrum at best and a wilful desire to cleave our relationship with Europe at worst.
Yes, we can all argue that Europe needs to be less dependent on the US, however what's on the other side of that is not pretty for the United States. Our ability to have the world's de facto reserve currency and hence our ability to sustain debt loads way in excess of usual is largely dependent on the US being the world's cop and sole superpower.
A truly multipolar world might be good for the world, but it's certainly not going to be good for the United States.