There's a difference between "more offensive" and "offensive at all". Seriously, when was the last time you taught a mon a Poison move for type coverage? Because I know I haven't. The only times I've ever taught Pokes Poison moves is for STAB and/or secondary effects.
At the end of the day, what this all boils down to is that Poison is useless offensively. All the other types can be used for attack, and I see no reason Poison shouldn't either. Water is a perfectly justifiable target for poison, considering the whole water pollution thing, and Water's so strong already, why not let it happen?
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