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The Chargers used to be a San Diego team. Their Stadium (Jack Murphy/Qualcomm) had gone through some sort of major refurb a decade or so ago. But the Spanos threatened to leave SD if another huge sum of PUBLIC money was not spent on their private business. Their demand was to build them a new stadium of about the same capacity as the old stadium but much more upscale. But they wanted public money for their private enterprise. They threatened to leave and THANK GOODNESS they didn't get the hundreds of millions they demanded. So they left. Good riddance.
However, the NFL forced the NFL to put a ballot measure for a downtown stadium near Petco, with the Chargers paying $650M and the balance paid through an increase in tourist tax (to a level that other large tourist cities charge.)
The Chargers reluctantly placed the measure on the ballot with election to place in November of 2016, but it's "legal mind" Mark Fabiani said it would need 2/3s majority to pass. This was in dispute and others said it only needed 50%+1. The Chargers continued a narrative that it would not pass, and other than the initial announcement, did absolutely NO advertising, no public call for a yes vote by Philip Rivers, Gates, LT, et al, like the Padres did with Tony Gwynn etc. for Petco.
To the contrary it announced in January of 2016 that it had entered into an option agreement (expiring in Jan 2017) to move to LA and Kronke's stadium as a tenant, severely souring both fervent fans as well as other San Diegans.
Despite all this the ballot measure got 43% yes votes. Political analysts stated that had the Chargers not announced their move PRIOR to the ballot measure, and had done even an average ad campaign, it would have easily passed. Of course, they had no intentions of staying.
Despite the ballot loss, the NFL still wanted the Chargers to stay in SD. The Commissioner floated proposals that included the Rams helping pay for a SD stadium (Rams were essentially forced to share with the Chargers, and preferred not to.) The Chargers quickly executed their option to move to LA.
So that is "the rest of the story" about the Chargers' move to LA, and why so many ex-fans hate the Spanos with a deep passion, and enjoy watching the trainwreck that they are.