So, you are on the "let's kill Hitler as a child" side of the fence?
No, because Hitler as a child hadn't done anything while a warlock already has. I mean if the first law is violated for example, they have already murdered someone. Three of the other laws are where you have basically raped someone's mind or body, causing permanent damage of some sort depending on how much you'd done. The other laws are basically getting caught messing with weapons of mass destruction (messing with Time, Outsiders).
The Council does these things because they know it's just too easy for a person to abuse magic. Wizards have an unfair advantage over roughly 99.999999999% of the population. The expression power tends to corrupt comes to mind, and once you've abused that power, you're likely to do so again. The Council's laws aren't perfect, and I agree that it's unfair in a lot of ways... But it's pretty difficult to monitor someone who uses magic, and ensure they aren't abusing it. Morgan was an incredibly gifted wizard, and a great deal of his energies were spent watching Dresden... Time wasted where he could have been defending others for example.
I don't think Eb is a good example. Not all warlocks are as powerful, and many of those killed by the Wardens' swords are young and inexperienced.
It's true that Eb is head and shoulders above most wizards, however Jim said that one of the things that makes warlocks so dangerous it that magic is about belief, and because they are basically insane, they can do some really scary, and crazy stuff. Their insanity makes them capable of really destructive magic. Look at the Asian teen who was beheaded. He had absolutely zero magical training, none. Yet he was making his own family members commit suicide with mind control. Imagine what he could have been doing with another 10 or 20 or 50 years of knowledge, experience, and training. That's what the Council is afraid of. Someone who's smart enough to avoid detection, and gaining that experience. That's why they stop them before they can get to that level.