I think perhaps, that you are getting confused between symbolism, and karma...which are two separate things.
Symbolism represents 'something'. That something may be :
(a) an 'association' in your mind, or
(b) a representation (whether image, sound, or otherwise) of the way your mind works / moves as you think & live
Karma is a cause and effect paradigm. If you do an action, it causes reactions (whether internal, external, or both).
Symbolic associations in your mind have the power to move your mind, and the minds of others.
If you look into NLP, you'll find that you can 'change' the way your mind normally moves, by associating (let's say,) your emotions with an object (real or imagined - though imagined is easier) (the object is the 'symbol') and then manipulating the (image of the) object (symbol).
If you look into Yoga, and probably Tai Chi, you will find that their movement and stances (among other things) are symbolic of the internal movement of peoples spirit / lifeforce / chi etc.
Anecdotes, parables, sayings, analogies - all have elements of symbolism in them.
The problem as I see it with the OP, is that the literal symbolism of any particularly event/object/concept itself is about your internal journey. I could understand the discussion of particular symbols and ranges of symboles if it was studied as a degree...
...but even then - each 'symbol' is dependant upon your own unique associations (which makes discussion of them problematic), and your own internal movements of your mind - which is also unique, and usually unrecognisable to yourself without training yourself, and then the other person would need a similar grounding...and then the movements symbolised may not currently be within your habitual range (such is harder to grasp)...
...in other words - I would view symbolism (of specific events etc) more as a personal learning experience than as something to be often discussed, and certainly not in any depth or frequency with someone who is not aware of such or has no interest in such (ie it would be pointless)