This is always the worst part of a potential breakup.
The dirty laundry gets aired. The public sniping comes from both parties. Those caught in the middle are implicitly (or explicitly) encouraged to take sides and point fingers.
In the case of City and County officials, they don't want to be penalized by voters if the Chargers leave San Diego. In the case of the Chargers, they don't want to annihilate a majority of their San Diego fanbase.
At the end of the day, only one positive has come from the airing of grievances.