Jam, I agree. It all comes down to the individual. The UN was a big one for me. I thought it was a downright lie. I even convinced myself that the letters and articles were fabricated by apostates to draw me away from Jehovah -- that is until I found official documentation from the UN on their website stating the dates that the WTBTS was a NGO member. After that the floodgates opened for me.
We can only offer suggestions, but when it comes down to it, we have to tailor TTATT to the individual we are sharing it with.