I think we need to have a anecdote to explain why defence spending and industry is critical for India's progress..
In my opinion:
Think of a India as a small house..
The roof over our head is the military and national security agencies, they expose themselves to the elements so that we can live our lives peacefully. if the roof has holes because of negligence none of the citizens will be happy.
The beams that hold the roof is our economy, it supports the roof from falling down. the roof supports the beams from wearing out.
The walls of the house are our culture, history etc... they mean nothing if there is no roof over the head. culture and history can progress only when people need not worry about who is going to attack us next.
The foundation of our house is our civilisational history, this is where our values come from.
I hope i am making sense..
Cheers...