Making Bitcoin a legal tender means when a person goes to purchase a commodity, instead of paying with dollar or whatever currency is being used, they pay with BTC.
Given the unstable nature of cryptocurrencies, and the untraceable nature, would you suggest it wise for countries to adopt Bitcoin as a legal tender?
Recently, El Salvador and Central African Republic announced that they have adopted Bitcoin as a legal tender.
In order to understand why politicians do not like bitcoin we need to ask what a politician may want? And this is easy, they want to remain in power and if possible to obtain more of it, the source of that power does not matter, it could be economical, political, social or some other form of power, what mattes to them is to increase it.
And what bitcoin does when it comes to their power? It reduces it, bitcoin takes away part of their economic power and gives it back to people, programmable money could even replace some parts of the government and the legal system, bitcoin can also make way more easy to hide your wealth which reduces the taxes they can get and the money they can confiscate out of you, all in all while bitcoin does not threaten them directly it has the potential to reduce their power in a significant way and they hate this.