A fun look at the meaning of "leiden" and what pity has to do with insults, passion and suffering.
leiden, leid tun, leider, die Leidenschaft, die Beleidigung, das Mitleid
The core idea of this root was:
It’s the origin of English to loath.
In German, it has focused more back on the suffering that might be cause for the loathing. Or the suffering that it causes to loath :).