Most of people who know well and research about bitcoin would support and trust bitcoin because they see many advantages of bitcoin and they can earn money from invest in bitcoin. People who hate bitcoin is banks and government, they can control bitcoin as the way they want and they see people is losing trust in banks and they have another choice much better than banks.
LOL. If Bitcoin will be legalized in any country, the bank system is these country will get a lot of trouble. They will lose a lot of capital cause people will withdraw all their money in bank to invest in Bitcoin cause it's totally better than bank and when they invest in Bitcoin they still can control their money not like deposit money in bank. That why there are a lot of bank trying to make the government in their country has bad thinking about Bitcoin and going to ban it.
Banks will lose not only the current assets. They will lose the monopoly on money transfers around the world. But banks is the one important business. They can only lend to the economy. Businesses will never be able to repay the loans in bitcoins. Perhaps banks will have to rely on government investment.