That's an unfair generalization. I could say the same of almost any other comic book character. Take the Punisher, for instance. For being just a trained but regular non-powered guy he's shrugged off things that would kill an army. Heck, he even came back from the dead at least twice. And not the regulars "No, I was only pretending" or "It was actually a clone" kind of deaths.
Plus, you seem to imply death is the only thing you should fear. Far from the truth. I think, for instance, a reality show star becoming president would be scarier.
I imply what I read from random goons, heard in his games, and seen in his shows. Most of the thugs always seem to have the idea that Batman kills their kind or worse. Yet no one ever dies. It makes no sense to me.
Also, I have the same problem with Punisher. But Batman is worse. Because of the degree of his plot armor and just the rabid love everyone has for Batman.
I mean, Why do people say Superman is boring and Batman isn't? Because Superman is so powerful, he can do anything. That would be an apt argument, but in the same breath most people will say Batman can always win because he's Batman. Why is being an alien God boring, but because so perfect because 'he's so cool' that no one can ever think he can lose NOT boring?
Superman's boring because he's a boyscout. He follows the rules too strictly. Batman follows his rules and the rules of law strictly as well. In fact, both are slaves to their moral code. But because Batman puts on a growly voice and threatens people, he's somehow better?
What's left? Batman is snide and demeaning? So are 80% of comics nowadays. So are 95% of real life people. There's nothing new there. He's Superman without the powers, yet the ability to do everything because everyone considers him perfect and with an attitude.
Personally, I like my heroes like Spider Man. But more to the point, Batman is the 'best' because people want him to be. That's Plot Armor. That's the Collective force of the Chosen Mary Sue that he can run with Gods and still keep up step. Green Arrow regularly says things are out of his league, and people will look at him funny if he tried. Same with the Question, Nightwing, and the rest of the non powered heroes. They'll go and do jobs to help the cause, but they won't stand in the main fight with Darkseid unless they really, really have to. And I'm sure if they tried to join the first wave, all the readers would go 'what the fuck'
But not Batman.
Only for the reason that he's Batman.