Earlier quoted context omitted.
I've never understood how stop losses are supposed to help. Traders read heaps of news, do God knows what technical analysis yet simple "moves bit too much in wrong direction" is supposed to be an acceptable exit strategy.
You're missing the bit that "moves bit too much in wrong direction" is a strong signal that your analysis is fundamentally flawed. Maybe catastrophic news came out since you bought in.
There are other ways to exit a position.