Many of them never will.
Financial Doping, Cheating, Bankers favoring them with unlimited overdrafts, their club's EBT Tax Avoidance - over 60 of their players on Dual Contracts, their club bumping around a dozen other football clubs for £millions in transfer fees, their club not paying £millions to over 300 creditors, their club not paying over £20 million in tax and National Insurance during the last 18 months, Rangers fans rioting and shaming themselves and the whole of Scotland in Manchester 2008 as well as here, there and everywhere both before and since then.
Too many of them just don't have the mental capacity to understand and some just don't want to understand.