Ken says: "Proof is not subjective. You either have it or don't have it."
Now that's just silly.

Every sensible person knows that there certainly are different standards for what we accept as 'proof'. The reason is there is no absolute proof.
But in cases where evidence is presented,
witnesses
- may lie
- may have misinterpreted what they saw
- may mis-remember what they saw
- may give excellent detailed and correct accounts of what they saw;
physical evidence
- may be misinterpreted by unskilled 'experts'
(that's why lie-detector evidence is no longer accepted; it requires more skill to interpret than the average department has on board)
- may have been corrupted in the lab
- may have been planted
- may have been correctly handled and interpreted, and may point straight at the accused.
The judge or jury may be stupid or inattentive; or may just want to go home early; or may have been bribed. But if they're competent and ethical, they will come to a decision as to whether in a criminal case the person is guilty, not beyond all doubt, but beyond reasonable doubt; but in a civil case, they can make a simpler decision: is it more likely the plaintiff has been wronged by the defendant? If so, find for the plaintiff.
So
as has been clearly explained above by several posts there is a difference in the standard.
For criminal cases it is usually 'beyond a reasonable doubt'.
For civil cases, in which usually only money is at stake, the standard is
- given two sides: for the plaintiff or not
that there must be more evidence on the plaintiff's side than on the defendent's side in order for the plaintiff to win.
This is called 'a preponderance of the evidence'.
preponderance: a superiority in weight, power, importance, or strength; a superiority or excess in number or quantity (MW)
Sorry I'm belaboring this, but I'm giving Kendor the benefit of the doubt, and think he just didn't get it so far; but of course I could be wrong. He may be guilty of block-headedness, and deliberately keep on flogging a dead horse.