The approach to sacrifice the interests of one party by voluntary is called dedication. This often becomes a necessary condition for social development.

It is good for you to damage your own interests and safeguard the interests of others, regardless of the size of the benefits. If you damage the interests of others and safeguard your own interests, then only when benefit is greater than the loss, it may be understood and allowed. To harm others' small profits to safeguard one's own interests, such as using the blood of others to save one's live, is also evil and needs to be compensated by rewards, thanks or other ways.