No, what I meant was, if you defrost it at room temperature, it will not instantly warm up to room temperature - it will slowly warm up. You're not forced to leave it on the counter until it reaches room temperature, you can choose to use it before that point (even though it is surrounded by room-temperature air). It's possible to have a less-than-room-temperature fish inside a room that is in room temperature.
Yes, that's my point. If you defrost in the fridge it's ok. If you defrost at room temperature then it's dangerous.
It's not extremely dangerous. Many people do it every day and don't die. But it's better not to.