The technology is useful and they can use it for sure, but for those who might be thinking that if governments use blockchain technology, things will start to become decentralized then it's not true. Even if they adapt the technology, and start using it for projects and stuff, they will try and create their versions of it that will be completely centralized and under their control where they can broadcast or delete blocks in the blockchain and manipulate the data whenever they want, otherwise, what's the point?

Do you think that governments are against Bitcoin or cryptocurrencies because they don't like the technology? Even they know how useful it can be, what they dislike is the decentralization which makes them lose control and they can't accept and digest that which is why they are hesitant and are always doing their best to either keep them away from people or regulate them as much as possible.