There's a perennial debate about whether the propagandistic tripe produced by establishment media outlets is shaped more by evil or by stupidity. Personally, I think it's both: a healthy dose of each is needed. The system design is malicious, while those who serve as its public face are generally vacant.
A human heart that matched what we think of as heart-shaped - a perfectly formed bright red thing with two halves of equal size - would be one that was horribly diseased. The origin of this stylized representation is somewhat obscure, but it probably appeared at the same time as St. Valentine's Day, about whose history there is much dispute.