Definitely. Ethical BDSM focuses on mutual respect and consent. Non - cons stories go against this. They may seem exciting on the surface to some, but they have the potential to desensitize people to non - consensual acts. It can also harm the reputation of the BDSM community which works hard to promote a healthy, consensual form of sexual exploration and power play.
There are indeed ethical issues. In a proper BDSM community, everything is centered around consent. Non - cons stories deviate from this core value. It can give the wrong impression that non - consensual behavior is okay in the context of BDSM, which is completely wrong. This can also be disturbing to those who uphold ethical BDSM practices.