ATR[D1] / 3 = SL
This formula allows your SL to not exceed the daily ATR by 1/3, if you have to let your trade continue going bad, then you aren't minimizing your risk.
As yourself this. Would you rather close out a ticket with a -30 pip stoploss or with a -300 pip stoploss?
Anyone who allows a bad ticket to run -300 pips against the account or worse, simply isn't using realistic risk management.
Letting a bad ticket run is a horrible idea.
It's no Big DEAL if you closed out the ticket with -30 pips, don't just immediately create a new ticket, wait for the next high probability trade setup to manifest in the markets. THEN trade.
Bad trades happen, everyone gets them. Minimizing the risk to the account is the highest priority. Protect the investment capital at all times.
If it looks too good to be true, it's probably a scam! Let the buyer beware.