“It says hoemes vehasholam ehovu, says the Maharam Shik that emes must come before Shalom.”
One is allowed to lie (or better yet change the truth) for שלום see what Hashem said to avraham
“We go by majority and an accepted fact by the majority is the truth which the minority must disprove. We pasken like the Beis Hilel being in majority.“
The reason we passed like בית הלל is because they were nicer not because of a majority