Will the doer find the punishment for what he did one day with karma and the universe?
I think the karma is due to the penetration of astral forces in our soul.
The soul can be view like an astral structure (or sculpure) which record skills, habits, reactions... and can be enhanced/reprogrammed during incarnation.
Every one attract/reject people or situation according to his soul radiation.
Universe/life always react according to our actions. If action match universal law, creative forces respond to the sender. And if doesn't match, destructive forces in return.
If someone takes advantage of the people's naivety, he either falls in with someone worse than him or sinks into corruption and lives in self-disgust.
If another one always meet sadistic people and stay with them, he either feels pain or becomes masochistic.
The first must avoid naive people and frequent people who are aware, the second must develop self-esteem.
They adopted these behaviors to hide their fears to themselves :
- The abuser is afraid to be abused, then he frequents more naive than him
- The abused one is afraid of being responsible, so he frequents tyranic people
To destroy the karma, you must firstly evolve else it's continue. It's psycho-mechanic.
There is no end in this process, there is always another thing to understand and a new skill to learn or tune.
Should we trust the universe and go with the flow?
We must understand the universe to know how to go with the flow.