Founder of 7th-day Adventists made a Jesus coming prediction, and his followers liquidated and waited. No, Jesus, He recalculated, and they waited a second time...

Not quite true.

William Miller wasn't the founder. Rather, he was a 32nd degree Freemason and grifter much like Harold Camping.

The people who bought into his date fagging, which they termed The Great Disappointment, had sold all of their belongings and were likely subject to ridicule and mockery from fellow Christians who had warned them the Savior had clearly said, "But of that day and hour knoweth no man, no, not the angels of heaven, but my Father only," after the world didn't end in 1844.

So when Ellen White, the founder of the Adventists, came along and said, "You may be disappointed the world didn't end. You sold all of your possessions and have humiliated yourselves due to your great faith. You were called to be a peculiar people. But friends, there's hope! Miller confused the prophecy for the end of the world with the date the Messiah and High Priest stepped into the Holy of Holies. The date wasn't wrong, just what the prophecy represented was what Miller got wrong!," she was able to convince those who couldn't admit they'd been fooled to join together as a community.

Miller had said the first date was wrong because he hadn't factored in the Hebrew lunar calendar in his calculations and had mistakenly used the solar calendar...

The main reason the Adventists became the 7th Day Adventists is because a 7th Day Baptist had joined the Millerite movement and taught them about the sabbath.