In the real cost of running a government if any of them truly wanted to disrupt crypto and make people loose faith and money in it till is disappeared there are dozens of cheaper / faster / easier ways to do it then having James Bond sneak into an engineers lab and change chip design to implement a vulnerability that may or may not wind up in a device that people use to secure BTC / crypto.
The goal doesn't have to be the complete destruction of everything crypto. It could be a way to get to people they otherwise couldn't or punish them. DaveF is making too much noise and has become a threat to our 'national security' (insert other bullshit reason) but we can't get to him. What do we do? No worries, we will make life harder for him. Give us 5 minutes and we will have all of his bitcoin. We've got backdoors for that sort of thing.