Prosocial means getting a group/everyone to do things.
But empathy is a feeling that an individual feels, group or no group. In fact, a group (collective noun) can't feel - only people can. Social groups can't have feelings, nor can they know/think etc - these events occur internally/within living humans, who themselves may then identify as part of a group. But empathy cannot be a group activity.
And even if we accept the linguistic shortcut, and agreee that the individuals in some group purport to feel the same thing, how can one know whether they feel it to the same extent? And that they are all of one mind to do whatever action?
Politics and feelings are really worlds apart, and intermediated by one's perception of the world. If you believe it is the group that needs to feel and do, you will look for answers in entirely different places to someone who thinks that only individuals can feel and do.
Empathy is one of the main prosocial traits that the second linked study analysed.
> Prosocial means getting a group/everyone to do things.
No it doesn’t, it means your individual behaviour benefits others. Empathy is one of the most obvious things to analyse when investigating prosociality because empathy motivates you to behave in ways that benefit others.