Thankyou for sharing your feelings and clarity. What you are describing is an ancient situation of deep imbalance that is older than planet Earth. The entire his-story has been one of immense imbalance, where emotions were continually denied and denigrated by almost everyone to some extent - sometimes knowingly and sometimes unknowingly.
This is probably the most complex topic that exists in this universe, but the very short version is that the heart brings real balance to all things, but to have heart requires our mind to have the sustained intention to balance with the emotions in the heart - so somewhere along the line the mind has to understand that it needs to do this before it actually experiences the benefits of it. Heartlessness is the absence of such an alignment and it is the default state of evolving beings who started out as effectively blank slates in the very ancient past. Therefore, we inhabit a reality where there are large numbers of beings who are partially or totally heartless and this is the cause of most of our problems.
The 'good' news is that many now understand this and are deliberately healing - plus we can improve our own experience and our own interactions with others by healing our own inner imbalances and ending our own denials. <3