Did I say mandatory? I meant optional! You’re “free” to die in a cardboard box under a freeway as a market capitalist scarecrow warning to the other ants so they keep showing up to make us more!
You left out some pretty important context in that quote to make it seem like it’s saying that realization is arbitrarily decided. In truth, all this is saying is that realization is not confined to reception of cash itself:
While it is true that economic gain is not always taxable as income, it is settled that the realization of gain need not be in cash derived from the sale of an asset. Gain may occur as a result of exchange of property, payment of the taxpayer’s indebtedness, relief from a liability, or other profit realized from the completion of a transaction.
As it says at the end there, the ways to realize gain all necessarily entail “profit”. A loan is not profit, nor is an already-owned asset transform into profit when used as collateral.
The above could absolutely not be used to support your argument, nor refute mine–not when you read it honestly and in context.
The capital gain is the profit, the collateralized lending is the transaction completed to realize that profit. It’s a logical extension of accepted understandings of those terms and easy to imagine coherent legislation to implement.
You don’t like the idea, that’s fine. But it’s simply not true to claim that it doesn’t make sense and you haven’t been able to articulate any inconsistency. Just saying “nuh uh that’s not profit” is pointless. We all know it doesn’t constitute realized gain in the existing system of laws, but OP and others are suggesting it would a be a sensible way to tax the extraordinary benefits that the ultra-wealthy take from their appreciated assets. It’s been explained to you politely and with sources, if you have nothing more serious to add to the conversation I’m done giving you the benefit of the doubt.