is NLP wrong? Morally?
Depends what your morals are. For the most part, no I do not think it is.
Everyone has the framework of NLP in their speech and conversational skills already, the best speakers more than others. NLP is just studying these skills and be able to deliver them consciously. Speed seduction incorporates about 25% of what NLP is all about, but if you are referring just to this then lets take a look.
Speed seduction is a form of manipulation, but manipulation shouldn't have a negative stigma attached to it. For example, when you buy a girl a drink or take her out for dinner, you are trying to manipulate her into sleeping with you. Also when a girl spends an hour making herself look pretty, it is also to manipulate more positive responses from other. SS along with the other schools of PUA are just much more effective ways to make women more attracted or w/e you desire towards you, and in most cases is not morally wrong.
If you have a strong mastery of NLP and patterns, then this field can be very powerful. It can be used in harmful ways such as The Hospital pattern or The Door pattern. You can change the internal workings of women and have them obsessed over you, which may lead to consequences if you choose to discard them later. All of Ross Jeffries stuff is completely harmless and he does not use extreme patterns that can possibly mess people up (ie. the Forbidden Patterns).
Ross's form of SS is achieved by creating an emotional state in the woman so she feels very good, then linking that to you. I do not believe there is anything morally wrong with this as you are providing her with an emotional experience that she relishes and usually can not find with other men. I'd say go for it, but be careful when using patterns that cause dependence on you or a fear of the outside world.