1. every bit counts. otherwise i might as well throw away money on everything since rent is so high. if you decide that your spending is negligible (or would be spent regardless), then we can agree to disagree; obv what u spend ur money on is up to u, but i am entitled to my opinion on it.
2. you might be right about that tbh, although i would like a source.
3. you are right that it doesnt actively take food away from hungry people. i meant to say that you can improve the situation by giving away leftovers (assuming they are still in reasonable condition).

as a side note, i think the way most people are introduced to the argument is by their parents when they are young. the parents are simply trying to get their children in the habit of considering others' needs, while also saving their own money. especially since most of the time the kid actually is hungry, but just doesnt want to eat vegetables or whatever. if someone (irl) is arguing the starving people card to you as an adult when u are wasting food, then that is less reasonable: though they have good intentions, i agree it is not all that impactful on those hungry. but again, every bit counts.