Evangelism. For centuries, many of the world's largest and most influential religions have practiced it. The idea behind evangelism is that one particular religion is the one true way to find G-d and to live a good life. It is therefore a duty, and an act of kindness, for the followers of that religion to "spread the word", and to help all of humanity to "see the light". I say to all evangelists: stop shining that accursed light in my face!
The Eastern Buddhist philosophy, that desire is the cause of all suffering, makes a lot of sense in terms of material wants. But when analysed in terms of more abstract desires - in particular the desire for knowledge - a challenging question becomes clear: is it good to desire some things?