This whole event would have turned out better if it was Ketki who was driving the bus and Mohan/Rahul helping out from outside.
Radha's work should have been just to divert the kids, chant banke bihairji slogans and bring out all her devotional skills. The director is immune to see how stupid/illogical she looks sitting at the driver's seat in this critical situation. A great blunder.
Tulsi should have been let out of the house and allowed to ride in the bus, edging Radha to keep chanting more and inciting Mohan through the window "kuch karo Mohan" and driving us to frenzy, would have been a proper climax that even the bomb would go limp