No more

[dihen]

It seems that someone would say something like:
`
"Nothing bad will happen, I don't think.".
`
Why not say just "Nothing bad will happen, I think."?

[JJD]

This is an interesting topic, isn't it?
My French friend says " I don't stop at nothing".
This means "I stopped because I found something interesting".
I thought this phrase was common in spoken English but now I guess this is a direct translation from French.
I have many European friends and colleagues who use funny english influenced by their mother languages.
I sometimes find it cool and I like the phrase " I don't stop at nothing".
How does it sound like for natives?