US and seized Bitcoin - Why Sell?

I have been wondering about the fate of the Bitcoin that were seized by the government during the Silk Road investigation. As far as I know, the government auctioned off most of the Bitcoin it had seized, and only a small portion was retained for various purposes, such as training law enforcement agents on how to use cryptocurrency.

However, I find it somewhat puzzling that the government didn't choose to hold on to more of the seized Bitcoin, given their potential value and utility as a store of value or investment. I understand that there may have been legal or logistical hurdles to doing so, but I'm curious about the possible reasons behind this decision.

For instance, was the government concerned about the volatility and regulatory uncertainty of the cryptocurrency market at the time? Did they feel that it was not their role or responsibility to speculate on the value of a digital asset? Or were there other, more strategic considerations at play, such as the need to avoid accusations of favoritism or corruption?

Furthermore, I wonder if there are any lessons that can be drawn from the government's handling of the seized Bitcoin for the wider adoption and integration of cryptocurrencies in the legal and financial systems. Could the government have played a more proactive role in promoting the use of bitcoin and other cryptocurrencies, or would that have been too controversial or risky?