Disclaimer: I Do Not Own Harry Potter.

Usually they cried out when he branded them with dark mark but not Bellatrix. Not that it surprised him because she wouldn't be like the others.

When he asked her why she wanted to be a death eater she didn't give the usual false answer of "I want to rid the of filth that plagues our world and it's an honor to serve you".

No, she said "Because I like killing and I like power, you're the most powerful wizard there is it'd make sense to join you. I also want the wizarding world pure, you want that too,".

Her answer was an honest one and he admired that she respected him enough to be truthful.

The others liked the power and were afraid that's why they joined him.
She wasn't afraid him, but afraid of failure something he'd use to his advantage.