Disneyland brings billions of $$ a year into Orange and LA Counties, to the park, to Disney hotels, and to thousands of hotels, restaurants, and store all over the counties. And while Disney might be the biggest gorilla, it isn't the only one. Knotts Berry Farm, Universal Studios, and Magic Mountain are also major theme park players in the two counties.
And as I posted above, Disney, Universal, etc. have already deployed and refined proper health and safety protocols in Florida and probably other states (IIRC, Magic Mountain is a Six Flags park). There is no scientific or rational reason for keeping these parks closed. It's a political tyranny designed to hurt California's and the US' economy. Because Orange Man BAD!