One "other factor" people (Omni) seem to overlook is that laws don't stop behavior. You can only fine someone if you catch them, often after the "perp" has possibly spread the virus.
If CA passed tons of restrictions, and FL did not, yet the results are similar, it's VERY POSSIBLE the two states were behaving similarly in spite of the restrictions. Enforcement of laws is always the weakest link when laws are intended to limit behavior.
It's why most gun laws don't stop crimes. Criminals won't obey, and police won't be able to stop them. Cops can only make an arrest AFTER the law was broken. Hence, there was no "deterrence" of the behavior.
Bottom line, people will do what they choose to do. 80% or more already VOLUNTARILY wear masks in public and/or socially distance and wash their hands. More restrictions simply make life harder on the law abiding. The others don't follow the rules. Just like gun laws.