Europe will be less likely to act if they perceive the U.S. being unwilling to use force against its enemies because it makes us a less reliable friend.

I think you are very wrong if you think that unilateral usage of force against international law (which a specific attack targeted on destroying industry clearly is) will make the US seem reliable to European nations.

I see the current deal as a U.S. betrayal of Israel and think other U.S. allies will interpret it likewise.

Israel prefers to have a weak Iran with little influence in other states in the middle East. Sanction weaken Iran regardles of the subject of nuclear missles.

Given Sunni ISIS there are advantages of a stronger Shia Iran.

There are no treaty obligations at all in which the US promised to attack Iran for Israel. I don't see how it could be betrayal.

Please keep in mind how Sweden reacted when Hitler requested access to Swedish territory to help with his invasion of Norway.

You mean like the US is also wanting to request to use Swedish territory to have military bases (Sweden currently not being a NATO country)? In Germany US military bases currently enaging in economic spying. The NSA even spied on the German ministry of agriculture.

I think you make a mistake of modeling countries as single actors when politics is much more complicated and there are a lot of forces within countries pushing against each other.