Why is empathy a hard skill

Heartmath researchers have found that the heart is a sophisticated information coding and processing center and the information that the heart sends to the brain is much more than what brain sends to the heart and the electromagnetic field generated by heart is perceptible at a conversation distance. This means that our loving kindness can infect those close to us even without shaking their hand, at a conversation distance. Can you now immagine why empathy is a hard skill?