I don’t see how it doesn’t make sense to build the justification after attacking.

You are already bombing. The justification is done. Politically it reduces justification because the public (as was shown) is now against the bombing. When Trump attacked Venezuela, he didn’t bomb a school, wait a week, and then kidnap Maduro.

Getting the other country to attack to justify war only works if you either make it look like they attacked first (false flag), or have deniability on your attack so their retribution can be spun into a first attck. (Secretly bomb the school with spies but leave evidence so they know it was you but can’t prove it.)

So there is absolutely no reason militarily or politically.