Sevin is not an accetable product to discuss or mention on an organic gardening forum. Yes it will kill the leaf footed bugs you have as well as all the others, maybe including yourself, since it is a very broad spectrum poison.
Whether you actually need to control them or not depends on which ones you have since some of the leaf footed bugs are predators, not pests, but insecticidal soaps do help when control is necessary, as to nets to cover the plants to keep insects from the fruits. There are tons of other ways to control any pest you may have other than these very broad spectrum poisons.

Yes, I would not mention Sevin in an organic gardening forum. Check out this manual for more info.

Here is a link that might be useful: Organic Gardening Manual