

Israel and trump appear to be claiming to have defeated the Iranian air defense, and achieve air supremacy over the Iranian capital.
If that’s true then Iran is in deep trouble, and inviting them to surrender wouldn’t be unreasonable. I very much doubt that it is true, but that’s what they seem to believe
It’s only true of badly designed bridges, these days. Modern engineering tools can calculate the resonant frequencies, and they make certain that those are far away from the frequencies which humans or wind can create