Actually you're wrong for reasons people already stated. Theft results in the loss of the costs incurred producing the product and lost profit (if you take it off the store shelf no one else can buy it, and it was very likely that someone would have). Piracy only results in a potential loss of profit (would the pirate have bought it?).
Piracy is its own can of worms and should be treated as such.
Great!
I still consider piracy to be stealing.
Every definition I see doesn't mention any thing about "results in the loss of the costs incurred producing the product and lost profit" not that I don't agree to some extent, just not 100%.
Software piracy fits with every definition of theft or stealing that I see.