You can't just arbitrarily set the status quo that way, can't just sneak a premise that the state has default a right to collect a piece of arbitrary appreciation on an asset (as all assets are used for speculation) when the owner hasn't actually gotten cash from that, and that any government that
doesn't tax that is just cutting someone a break on something rightfully owed. The state of nature is no tax, and as it's unpleasant, we create societies and fund them with taxes that we must deliberate and determine to be just and reasonable. You don't get to argue from the point that your preferred taxation regime is simply how things should be and that how things are is therefore wrong, especially not without a justification.
I'd also point out that people's assets have gone up in nominal terms in the past few years, but for many that's not reflective of an increase in purchasing power. Much of that increase is due to excess inflation from the profligate overspending of our past two administrations, so the cycle currently looks like this: government prints money and causes inflation -> your assets are "worth more" -> taxman says "give me a piece of that" even though your real wages have fallen or have just barely recovered to pre-2020 levels. And of course, even if we index to inflation, that will necessarily hit the poor harder: food and energy are deemed "too volatile" to include in headline CPI, but as necessities, they comprise a larger part of poor households' spending and so inflation will hit them harder than the numbers suggest.
I'd also point out that people's assets have gone up in nominal terms in the past few years, but for many that's not reflective of an increase in purchasing power. Much of that increase is due to excess inflation from the profligate overspending of our past two administrations, so the cycle currently looks like this: government prints money and causes inflation -> your assets are "worth more" -> taxman says "give me a piece of that" even though your real wages have fallen or have just barely recovered to pre-2020 levels. And of course, even if we index to inflation, that will necessarily hit the poor harder: food and energy are deemed "too volatile" to include in headline CPI, but as necessities, they comprise a larger part of poor households' spending and so inflation will hit them harder than the numbers suggest.