There’s been a lot of talk about the potential for the government to co-opt and/or seize miners to 51% attack the network or reorg the chain on an ongoing basis lately. 

One thing that I think isn’t given enough thought in these discussions is the fact that coinbase rewards aren’t released to a miner until 100 blocks after the block they mined.

Can’t exactly put my finger on it, but I have an intuitive feeling that this is a crucial part of the game theory that many are missing. 

 I'm surprised people would be talking about something so improbable. 

It's kind of tough to purchase/acquire(?) hundreds of thousands of ASICs, spend billions in infrastructure and divert tens of GWs w/o anyone noticing; particularly so when you're bankrupt. Also — imagine what this would do to their narrative (chills).

Sounds like a statist wet dream.

Now what's a "CoinBase reward"?   

 The USA government does not have to do anything in secret.

They just take over the mine and let the miners stay where they are.

Where did you get the idea from that they have to "move" them and it has to be "secret"?

If everybody panic sell the news about it, the USA government would be happy...not sad.

The USA government could attack any PoW blockchain 365 days a year with the "nationalized" miners.  

 Correct. That is why no jurisdiction should host more than some % of total hashrate. The faster governments understand this, the better.