Quote
In Episode I we see Qui-Gon Jinn being the one who does just that. Obi-Wan Kenobi only takes over this 'job' reluctantly after Qui-Gon Jinn has been killed at the end of Episode I.
we already know that Obi Wan speaks from certain points of view and not always tells the truth as it is. so in a way, he did take it upon himself.