The reason they are so strict is 100% because of all the jerks out there who poach, kill short fish, keep more than their limit, purposely fish without a license, etc., etc. - you've seen them - just go to any pier.

I agree with you that it is harsh and the fine is "excessive" for an "honest mistake" but you should not blame the DFG, judge, or system - the blame belongs to the poachers.