If you are proud of your murdering of someone is that altruism?
Jumping on a grenade doesnt give you time to feel good about your actions
The definition of altruism has no requirement for you to feel no emotion about your actions
https://www.merriam-webster.com/dictionary/altruism
altruism
noun
al·tru·ism ˈal-trü-ˌi-zəm
Synonyms of altruism
1
: unselfish regard for or devotion to the welfare of others
charitable acts motivated purely by altruism
2
: behavior by an animal that is not beneficial to or may be harmful to itself but that benefits others of its species
It's implicit in "unselfish".
Doing for others does imply feeling good about your actions
Without self sacrifice for others we would not exist
We would have died out very quickly
https://www.merriam-webster.com/thesaurus/unselfish
Again no requirement the actor doesn’t feel hood about their choice
Jumping on a grenade doesnt give you time to feel good about your actions
This
The meaning of words matter
Altruism requires that you care about others
Unselfishness also does
Separating our mankind’s tendencies to place harm to others over self harm
It’s what makes us human
Those that would not act this way are in fact lacking certain human traits
It’s called sociopathy
Based on a false definition of the very word you are concerned with
Altruism does not require a zero emotional state
This is a "No True Scotsman" fallacy. Are you contending that there is no self-sacrifice? If so, your contention is absurd. If not, you are acknowledging altruism.And I contend that there is no purely "self sacrifice".