Some people dont want to see their code being used in a context that might hurt a other human being, like spyware hidden inside a video player. Say someone modified VLC to produce a proprietary video player which included functions that spied on the users activities. As a developer, I would feel slightly at unease if I heard a Chinese citizen died because he watched a unpopular video, and the government found out because the program I wrote helped in spying and identifying that user.
Of course, that doesn't make producers of LGPL (or BSD/MIT) software evil or uncaring. Its up to each and every developer on how they view their work and its impact on society, and how far one want to go on that. Same goes for work, eating and spending habbits, money investments and so on.