Richardson over borrowed using other peoples money and when the board found out the truth they were horrified and tried to claw most of it back.
They still couldn't save the situation and even after selling everything off they owed a substantial amount and had been bailed out by the Higgs (something Higgs should not have done IMHO). The former directors paid for their hobby of owning a football club, like others have before (Jordan, Sugar, etc. the list is long).
They sold to SISU who paid the tax bill and promised to pay the former owners £6M if they got the the premier league (no chance, SISU did not have the funds or motivation).
SISU have steadied the finances, but got the club relegated in the process and continue to sell assets. If they had done this with a degree of honesty and been reasonable at keeping their word they might have kept the goodwill of their potential partners, instead they've made enemies of everyone else involved and burned all their bridges.
All of this is history and can't be changed. The club is still up shit creek without a paddle.
Don't worry about the past, it is a distraction, worry about the future, where is the Academy training in 3 months time, where is the club playing in 15 months time?
We still have bad owners, till we get an owner who works for the good of the club nothing much will change.