There are occasions where a turnback is entirely appropriate; especially if there is a cross runway available and you have enough height. Picking up on a previous post, I think glider pilots are far more attuned to the options in such scenarios, something I have noticed when converting them to SEP.
Yes, if you are at a safe altitude for a turnback, but if you are the slightest unsure about that DO NOT turn back. Gliders and SEP have one significant difference, i.e. 10/1 versus 50/1 glide ratio!
Glider pilots will obviously be more attuned to engine failure scenarios, but it's important to remember that the number of options in a glider is significantly higher compared to a SEP. If an experoienced glider pilot would base his turnback decision on previous glider experience he could be in serious trouble in a SEP.