On OLPC: I became slightly less enthusiastic about it after reading this; there was also some discussion of this here.

It also has this advantage; the process is likely to be slow enough that a significant fraction of humanity will be enhanced at the same time, or close enough to the same time that none will be able to stop any of the others' enhancements. This drastically reduces the probability of being trapped by a single Unfriendly enhanced human.

Well, our offensive technology is far ahead of our defensive technology. Despite being on the whole human-friendly, people keep running around trying to kill each other; sometimes we stop them and sometimes we do not.

One of the reasons people give for trying to develop AGI quickly is that, if done right, it would protect us from all the other things that are trying to kill us.