The way Winterfell was handled was...... dumb.
So we basically had 7 episodes of filler, fake drama in Winterfell. For no reason. They didn't get any new evidence on Littlefinger, all they had was 3 teens claiming he did those things and everyone was still cool with LF being murdered. So why not do it in episode 1? Why have all this elaborate fakery?
Well, no reason of course. It was just D&D wanting to take the audience on an emotional rollercoaster even though it makes no sense. God bless D&D