The fall of Luke's Jedi order makes no sense

In the prequels, the Jedi were shown to be a flawed organisation that had lost their way by becoming too involved in politics. This was the downfall of the Jedi of the prequel era. When Luke resurrected the Jedi order, he created a new order, one that would be more faithful to the Jedi of old. We know the personal failing of Luke (which I personally find super contrived) and what caused the downfall of the order, but it seems weak, as because we haven't been told any conflicting knowledge, we assume Luke's Jedi had been going strong up until Ben Solo turned. Does anybody else find it super unsatisfying that Luke's order fell through no fault of its structure or beliefs, and instead was completely destroyed by one freak incident? Furthermore, how can writers expect us to think a Jedi order will fare any better under Rey? If LUKE SKYWALKER can't sustain a Jedi order more than 30 years, how can we assume that Rey will? via /r/StarWars https://ift.tt/2Mjv7oK