(1) The presence of pain is bad.
(2) The presence of pleasure is good.
First, I reject both of these premises as false if you are speaking of them as absolutes.
Physical pain, in my opinion, is, at its base, a good. Take this case here. The girl in question has seriously injured herself because she cannot feel pain. As we can see physical pain prevents damage and, in most cases, does no lasting harm. Now an excess of pain is bad, but then this is true for most things.
Emotional pain can also be a good. Shame and guilt can help to prevent harmful social behaviors. So can fear. Now can they be misused or felt in excess? Yes they can, but I would not want to live in a world where they are absent.
Also pleasure is not necessarily good. Pleasure can come from sources harmful for either the recipient, others, or both and, as pleasure can reinforce this behavior, pleasure, in this case, would not be a good. For example someone may gain pleasure from a harmful addiction; this pleasure would not be a good.
Second, though death is often painful I would like to see evidence the majority of times it causes overwhelming pain as, if I’m reading correctly, you seem to be implying. I’ll take myself for an example here. I’ve had close friends die suddenly. Now this made me sad, but to say the pain was overwhelming or even especially bad would not be the case. Now I personally view death, in the current state of the world, as a good (though one to only be obtained at the appropriate time as life is also a good), maybe this makes me weird, but it is a common Catholic teaching.
Also, I don’t see how something can be good or bad for something non-existent. It is not a good for me complement the non-existing person in the room with me or to refrain from hitting them. Nor is it a bad for them for me to try and hit them or to call them names (though I suppose attacking non-existent things could be a bad for me.)