I don't know enough about Keynes (or Economics) to tell whether I am a Keynesian.  But I certainly do not "hate people saving their money", quite the opposite:  I wish people (and my compatriots especially) would consume less and invest more.  But I would like to see them choose productive investments; and hoarding currency (or gold) is not productive.

Hoarding currency is bad for the individual, because all currency will lose value eventually. (As you well know, I am sure that will happen to bitcoin, too, even if there may be another bubble or two.)  Hoarding currency is also bad for society because it harms the currency, by destabilizing its value.

Let me reming people that this discussion started when someone asked for my idea of a good cryptocurrency.  Well, among other things, a good cryptocurrency should be designed so that no one will be tempted to hoard it.