I think that goverments was afraid coz they thought that bitcoin is for buying illegal items or do some  illegal activities and the bitcoin those not pay a tax.

I hear about bitcoin when  my son told me about it. His classmate encourage my son to join in bounty campaign and now  he earn money and he is support his studies, now my son teach me how to post and campaign bitcoin. I really love it, I earn money now, thanks to bitcoin you are big help for me.