If you bought 1 BTC at the lowest price this year and sold at the highest price, you made 5 times your initial investment, with 0 work. Why shouldn't it be taxed ?
In my country (France) until a couple years ago capital gains were taxed as income, that was an advantage for poor people (but poor people rarely have capital gains) as their income tax is low, 0% or 11%, but for middle class people it was 30% and then 41%, 45% or more for rich people. That applied to crypto but also stocks.
Now this has been changed and it's 30% across the board. Some losers, some winners.
Of course in France we get a lot of stuff from our taxes, in India that's another story.
We have a similar situation as I wrote earlier, now we only have a 4% difference in capital gain taxes. You are right, sometimes people tend to forget what taxes are for actually and one will realized what there is behind paying that much only when in need (this happened to me to after having a surgery operation coming from ER).
There are loads of free riders (especially rich people who avoid to pay many of their taxes) and this reflects on the many differences if you find from North to South.
Regarding bitcoin I would like to see a flat tax only on realized gains (with no crypto to crypto taxation, which are a complete mess) when we cash out euro.