Yes it can be. Just check out the news. When someone dives into a river to save a child from drowning, the first thing people will ask is why they did it. Invariably, they will say, they didn't think, they just did what anyone would do. It was instinct, just like the amoeba.
Okay, I guess it can be. But that does not mean that altruism did not evolved from selfish desires. We our a species who's ancestor came from local groups/tribes that comprised of probably of about forty members, most of whom were are kin. Of course , when one of the members of our ancestor's small tribe was hurt and injured in any sort of what, or their life was threatened, the members of the local tribe would probably be greatly concerned not only because losing one member would decrease the chances of the tribe survivals, but losing a member of the tribe would also decrease ones chance of shared genes being flourished to the next generation. For subsequent generations, as our tribes became less localized and more globalized and therefore encounters with kinfolk became more dispersed and spread all over near and far populations, and this trait was passed onto our gene pool but this trait was expressed when we encountered local people who our in danger but do not share the same genetic makeup. Going back to the man jumping into save the drowning child, guilt would perhaps enter and stay in his mind if he decides not to saved the child and he would feel partly responsible for not taking the opportunity to saved the drowning child. In order to save himself the experience of 'if I had used that opportunity to saved the child when it was open, the child would still be alive'. One could interpret that as a selfish act because you don't want have the burden
Similarly, there are occasions where doing things for others makes us feel good, or where we don't even think, we just act out of pure instinct. The first is probably less altruistic than the second, but feeling good is not an inkind exchange. When you feel good about giving to charity, the charity is not giving you anything. You are rewarding yourself with a good feeling. That is different.
. I think often we feel good when we do a charitable act, especially if their our minimal losses at our end when one carries out a charitable act. I disagree with you about feeling good not being any of exchange value. Just because the exchange value is not a monetary value does not mean that it is not an exchange. For example, even though this act that many humans engage in is not based on monetary value, humans engaged in sex for pleasurable reasons other than procreation or we eat a certain kind of food because fires up our tastebuds.
Most human behavior is habit and instinct. Even if one believes in some sort of freewill, most of the daily 'decisions' we make are only vaguely voluntary. Do you voluntarily choose where your foot lands every step of the way when you are walking down the street? Of course not.
Actually , I do. I make a conscious effort to avoid the cracks of a square block sidewalk.Yes, some of the actions we carry out daily, waking up , sneezing, yawning, having a sense of smell, our all involuntary. However, I would not go as far as the actions carried by many humans rarely voluntary. There are plenty of actions that our voluntary, such as :elevating your thinking, forming friendships and breaking up courtships, driving , blinking(even though we can't understand how we carry it out on an elementary level , its still voluntary, deciding where you want to live, making the choice of whether or not to go on a school shooting spree) , All of those actions and most actions carried out by human beings are voluntary and so free will cannot be an illusion. Because if it were an illusion , why would we have choices ?