If you feel guilty dont push yourself over it... but i dont see how fan translations for non japanese speakers/readers can hurt the authors, unless the rights have been bought from overseas companies and authors receive a % of each buy...
Also if they go on hiatus over fan-made stuff... the manga world would have stopped by now with all the fan art, fan made stories with manga/anime characters (AKA doujins), parodies, etc. So i highly doubt that was the case, but if by some extremely low chance it was, then their mental is extremely crappy.