You don’t need to avoid all negative emotions. A ratio of 3:1 to 12:1 of positive emotions to negative emotions is ok. Everything outside of that range is bad, as a rule of thumb.
And if you think that anything that changes the emotional reactions in other people involves “lying”, then you seriously need to learn how to communicate better. I think there are good books about that, but honestly I haven’t done a lot of research on that topic, either. I’d suggest the “Feeling Good Handbook” by David D. Burns as first start (because I’m familiar with that):
This solution doesn’t scale, if you want to reach a large audience. It’s better and easier to change your own communication style to achieve the effect you want to achieve.