Parvateshwar: And tomatoes are fruit, so in no definition does processed purée fit into the vegetable category..
While tomatoes are scientifically fruit, the consensus in cooking technique is that they are used as vegetables. By the way this is also applicable to eggplants, peppers, peas,... Reverse cases are rare but do exist (rhubarb).
And, well, there should be no objection to having tomatoes, eggplants , whatever served in schools, although about all other preparations would be preferable to pizze ( The problem with pizze is about what actually ends up in and on it ). Tomato leaves would be less tempting. Slightly toxic too...
thme: If a glass of red wine a day is good for you, then why not a slice of pizza?
Just remember that Beaujolais Nouveau is not wine.