Raven is a precision bomber, so it only has a nominal area of effect to ensure its bomb actually connects cleanly (it would only do area of damage on friend or foe if units are literally on top of each other, which should only happen to the smallest of units, if at all). The explosion of the Raven bomb looks a little more impressive than it actually is.
If you want to hit your own units with a bomber like a real world military, any of the other bombers will do the job. Likho has a pretty sizable AoE to match its bomb graphics, Phoenix obviously is a carpet bomber, and Thunderbird will happily disable your own army if you don't use it carefully. (Revenant and Krow in the gunship plant fit the bill too for big AoE that will also wreck a friendly Glaive ball)
You can also build a few Phantoms or Lances, I promise you'll have all the friendly fire you could ever ask for, and then some :D Normally people complain that units are too prone to causing friendly fire, not the other way around!
