The vast majority would absolutely plead guilty.

If you cannot afford a lawyer, and the prosecution offers you a choice:

a) Go to trial. Lose your job. Get life altering debt. Spend a year or more stressfully fighting. Have your movements controlled, maybe be imprisoned. And THEN maybe you get proven innocent. Then there's a risk you get found guilty and face severe consequences.

b) Say you are guilty. Promise to pay a couple grand. You go home to your family tonight. Keep your nose clean and we'll seal the record in three years.

Tons of people would choose the latter.