Appropriate evidence is true what you say. But i think the controversial bitcoin comes more from the mouth of a government, whether it's good or bad news when the government speaks then all citizens will know it. The proof is there are still countries that still consider illegal bitcoin and that's all because mouth of a governments who think that bitcoin is a negative thing so that someone's response about the news spread from mouth to mouth. Only for people who really know bitcoin who never believed what the government said.
What do i say include?
It is more of the governmental negotiations and deliberations these days that have it a very controversial topic!! These days all the FUD that media has created regarding the bitcoin including the very buzzing news of government legalization, facebook and google banning the crypto advertisements has made it all the more a controversial topic.