For what it is worth, "injurious" in this context means "injurious to the interests of human beings, agriculture, horticulture, forestry, wildlife or wildlife resources of the United States" (source). This is almost entirely a matter of avoiding and minimizing enviromental damage from invasive species -- hence the listings of big tropical constrictors following on the coattails of the burmese python situation in FL, the listings of invasive aquatic species, and the recent salamander listings.
There's no reason to believe that the risk of personal harm underpins the FWS listings; there's no substantive discussion of it in this history of listings, and reptile species more directly dangerous to human health aren't listed.
Whether state lawmakers misunderstand this use of 'injurious' is another question, of course.
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