Ralph is the only boy who truly recognises the significance of Simon's death. Piggy is ready to lay part of the blame on Simon himself and the dance, the Twins are in total self denial and Jack dismisses the entire episode as a 'trick' played by the beast. Ralph alone gives the deed its true name, murder, and Ralph alone seems to realises the depths to which they have sunk and the ferocity of their attack. Ralph too realises that having gone this far Jack and his tribe are now capable of almost anything.
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Jack believed the dance would keep the storms from coming, so under the threat of bad weather and Jack's manipulative nature, Ralph and Piggy joined the dance, even though they did not want to.
I don't think that Ralph deliberately lies. I think that Ralph is so traumatised by what he experienced that he finds it difficult to come to terms with it. Ralph does actually say to Piggy things such as you didn't see what they did and it was murder, so he isn't denying what happened, he just doesn't want to relive the experience by discussing it with Samneric and apparently they feel the same way.
it scares the littluns and they feel endangered
Ralph thinks things have changed for the worst because they have to start killing and eating each other to survive. btw ik this answer is 100% right
maybe u should look in the book in chapter 4.