You're probably gonna hate this, but this is me agreeing with you on this subject.

The system is not logical. It picks up and drops charges on a whim based upon the desires of the prosecutor. There may be bias and there may not be. But it's hard to do a charge only comparison because the whole trial system gives weight to specific details.

I've seen cases where prosecutors nail perps who've only been jailed once or twice harder than other repeat criminals because the perp is suspected in more crimes so he was vigorously pursued while the other was just passed through the system and given a minimum sentence.