> Untraceable money
Bitcoin is pseudoanonymous with it's public ledger, hardly untraceable. Look into Monero for a proper anonymous coin.
> Untraceable money means that corruption and tax evasion would be easier than ever.
A contrary point is that today corruption and tax evasion is only for the very rich, see the paradise papers for example. In a sick way this could give the common man more power and maybe make the world a little more balanced.
Also tax collection is already heavily based on social pressure and doing the right thing. It's not obvious that the threat of getting caught, compared to the social stigma, weighs more.
> Deflation means that the rich will get richer doing nothing while the poor won't be able to get a loan to bootstrap their businesses. Forget about trickle down economics, this is downright "trickle up".
I also don't like extreme deflation, but I also don't like the inflation based system we have today.
Inflation basically eats away at your savings. This is a bigger problem for everyday poor people compared to the rich as they have more investment options. Their buffer they hold in banks or in cash is smaller percentage wise, they can more easily invest in housing and they can more easily grow their capital as money breads money. The problem with rich getting richer is already present.
Without inflation loans would harder and would combat the very real problems with too much loans (housing bubble, student loan crisis, ...). It could also help to reign in fractional banking as it would get riskier/harder.
