First off, let's look at Harbaugh's quoted statement:
“It’s more the Saints,” he said. “The greater share (of the prep) is for the Saints.”
Ok, he said "more" and that could mean (a) slightly more than the other teams or (b) a lot more than other teams. Given your reaction, I'm going to guess he is spouting off about a cherry picked comment, without hearing that Harbaugh said we'll prepare for all 3 teams we will face. Well Mr. Raiola, are you even intelligent enough to understand the Lions can't travel to SF in the divisional round, should they somehow pull off the upset?
Secondly, let's consider simple math. Leaving strength of teams aside, there is a 50% chance the Niners will play the Saints and a 50% chance they will play the winner of the Falcons/Giants game. Stay with me Dominic...this is where it gets tricky. See you divide the 50% between the Falcons and Giants, giving the Niners a 25% chance to face either of those teams. Now, see if you can tell me which is more...50% or 25%.
Finally, the possibility does exist that the Lions will win. If the refs don't lose the game for you (/sarcasm off Lions fans). However, you're playing in New Orleans against a widely recognized better team. Oh, and yeah, they beat you already. Realistically, the chances of the Niners playing the Saints is probably higher than 50:50, but I won't try to do any advanced algebra and completely lose you. Further complicating matters, we've already played and beat the Giants. That reduces the need to plan for them equally to the Falcons, wouldn't you say?
I suppose you took the word "more" to mean Harbaugh and the Niners assume the Lions will lose and are only focusing on that scenario. I guess there's no way in your simple mind that the Niners may be intelligently spending 50-70% of their focus on the Saints, until we know for sure who we play. We also have another full week to focus on that one team champ - that's how the bye works.