Transgenic Plant
The controversy regarding the use of Bt corn is that it

both (a) and (b)
is potentially harmful to monarch butterflies
is a potential allergen to humans
can contaminate groundwater

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Transgenic Plant
In transgenic plants that have been manipulated to express patho-genesis-related (PR) proteins all the time it has been shown that

these provide no protection at all against pathogens
these proteins trigger the production of other antimicrobial defenses
expression of two PR proteins provides some protection against a few pathogens
expression of one PR protein provides high levels of protection against many pathogens

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