Why do I waste time researching and posting stuff? You're like the global-warming denier who told me straight up that no matter what the evidence was the other way, he'd never believe it. Jehovah himself could come down from on high: "Archimedes, you're full of shit!" and you would still argue with him. Please believe what you want, but the facts and law are not in your favor.
Anyway, here's the statute for Reckless Driving. There's no such thing as "reckless endangerment" in the CVC:
Reckless Driving
23103. (a) A person who drives a vehicle upon a highway in willful or wanton disregard for the safety of persons or property is guilty of reckless driving.
(b) A person who drives a vehicle in an offstreet parking facility, as defined in subdivision (c) of Section 12500, in willful or wanton disregard for the safety of persons or property is guilty of reckless driving.
(c) Persons convicted of the offense of reckless driving shall be punished by imprisonment in a county jail for not less than five days nor more than 90 days or by a fine of not less than one hundred forty-five dollars ($145) nor more than one thousand dollars ($1,000), or by both that fine and imprisonment, except as provided in Section 23104 or 23105.
Amended Sec. 19, Ch. 739, Stats. 2001. Effective January 1, 2002.
Amended Sec. 16, Ch. 682, Stats. 2007. Effective January 1, 2008.
Oh, and here's how the CVC defines "offstreet parking facility":
As used in this subdivision, "offstreet parking facility" means any offstreet facility held open for use by the public for parking vehicles and includes any publicly owned facilities for offstreet parking, and privately owned facilities for offstreet parking where no fee is charged for the privilege to park and which are held open for the common public use of retail customers.
Why do they need to define off-street parking facility if the CVC applies to any public thoroughfare as you say? Hmmm.
Where does it say the reckless driving statutes apply to parking lots but the helmet law doesn't? And actually, IIRC, it was contest of speed that they got him on, not reckless endangerment.
Regarding the second case, you're missing my point. The only reason he got out of it was because they convinced the judge that it was truly private property, not available/accessible to the general public. The land was an orchard and packing company and the cop argued it was a public place. They had to convince them that it was not and that it was only available to approved contractors and employees, or he would have been f$cked.
A parking lot maintained by anyone for use by the general public is considered a highway and the CVC applies - all of it. The OP can fight it and maybe win for any number of reasons, but it won't be by arguing the law doesn't apply in that parking lot.