I read an article predicting this outcome a few weeks ago. Israel is our ally so this was the way foreign policy experts expected Iran to take revenge. Israel is our client state. That's why we generally take their side. It's not out of the goodness of our hearts. Even when Obama was in charge they got massive aid packages, because they are useful to us. I wouldn't say I trust them exactly. It depends on the context.
That said, I am pretty unequivocally on the side of Israel, which isn't to say that I think everything they do is right. Still, if Gaza were on the US boarder with Hamas sending (and paying) terrorists to kill our civilians, we would have bombed it out of existence long ago. Look at how many countries we've carpet bombed for far less.