Gunnar's puppyhood was not filled with "no" and pointing fingers. I used redirection, like if he was playing and decided that biting your fingers was fun, he got a toy put in his mouth. But once he learns what behavior is acceptable and what is not, you shouldn't have to keep redirecting. If he decides to take a chomp out of my hand when we're playing now, he is told no.
Can we get off of comparing dogs to humans? By the time a child has the faculty to process language and reason, it can't be compared to a dog. If I caught my kids doing something wrong, I can say no to get their attention, and then explain why what they did was not acceptable. Kids have the brain power to comprehend reasoning, so when you explain it to them afterwards, they understand and hopefully won't write on the walls with crayons again or whatever caused them to hear no in the 1st place. Sure, if you always told a kid no and never explained yourself, you might be looking at a time bomb, but if thats how someone decides to raise their kids then there are bigger problems.
By saying no to Gunnar when he gets that look in his eye just before he takes off after the cat isn't going to cause him to eat the cat when I'm not around. I can say no, hah, hey, Gunnar, whatever- it gets his attention and he focuses on me rather than the cat. It's a distraction but one that can be administered from a distance. You can't always be right on top of him to give him a physical redirection to a toy or something when he's about to go full tilt at the poor cat who is 20' on the other side of him from you.
Using words like hah is the same as saying no (hah is used a lot in my house- for more of a minor correction, with no being used when something is really being done that is wrong- hah when he decides to break his down/stay command, no when he chases the cat or tries to make Bruzers leg a chew toy). I can't see how substituting any word for no is any better or worse than telling the dog exactly what you mean. You say hah or whatever to your dog all the time, it's just like saying no, and in your example, then the dog is going to explode anyway.