The risk should have been visible to a layman.

Hate to defend Trump, but in this he is kind of innocent. Saudia Arabia was attacking Yemen well before the Iran war started. Plus the timeline of events here is something like this:

• Yesterday Houthis said "if you attack our oil infrastructure here is a list of retaliation targets"
• Then Saudi Arabia attacked Houthi oil infrastructure anyway
• Then Houthis attacked the targets they previously listed

Besides the Aramco HQ in Dhahran, there were also refineries in the area that were attacked, plus at least three sites in and around Riyadh were attacked as well.

Source: https://yemen.liveuamap.com/en/2026/13-october-13-the-houthis-have-announced-the-locations-they