My issue with the concept of centralized power in the society is that it has a tendency to consolidate over time and if left unchecked, tyranny is almost inevitable. Sure, you trust your government now, but nation-states generally have a very ugly history of oppressing and even exterminating portions of their population every once in a while. I just don't believe that they can be trusted not to do it again. Not everyone is a good person, and many people in the higher rungs of power tend to have psychopathic tendencies.
So at the end of the day, you don't trust your physical assets not to betray you, but you tend to trust the society you live in. My mindset is completely opposite: I don't think that people can be trusted not to do bad things. You mentioned bitcoin, and I think this is one of the elements that it solves almost perfectly: it eliminates the need for trust, if used correctly. Strong gun rights solve the same problem, they almost completely eliminate the need for trust: I don't have to trust the society to respect my property rights, I just have to trust that most people are not crazy enough to try to get themselves shot.
I think socialism is a nice concept and I think that the idea of helping the less fortunate is commendable. The problem is that it has to rely on the coercive element (uniformed men with guns showing up at your door) if you disagree with the system.
Not to drag this out much longer; as someone who strongly believes in non-violence, self-ownership, self-governance and rejects most forms of collectivism, I can't agree with pointing guns at people in order to create a safety net for others. It defeats the spirit of charity and looks more like extortion and robbery. In my opinion, helping the less fortunate should a voluntary act that stems from one's desire to do good, rather than fear of being violated.
I think the origin of my socialism is that, honestly, I don't trust things. This is a topic that often comes up in Bitcoin threads: there is no such thing as a perfect store of value. There is no thing I can invest my time or money in that will not decay or depreciate over time. Currencies inflate. Houses fall down. Land fluctuates in value and can agriculturally fail. The gold supply inflates at a roughly constant rate of 1.5% as people dig more up. Uranium decays, albeit slowly.
On the other hand, I have a very positive view of social networks. I grew up in the middle of a strong safety net. My parents, my siblings, my aunts and uncles and cousins, we grew up close. If I needed help, they'd give it. If I lost everything today, they'd take me in for as long as I needed. Since then, I've acquired a few close friends who would help me out, with a job or a place to crash.
So even if I cannot trust my things not to betray me, having fifty people and all their resources there to catch me if I fall brings me a great deal of security and comfort. So I like the added layer of protection that comes from a safety net of 300 million people. I don't view taxes as something being taken from me, I view them as an investment I'm making in the only resource which has a chance of holding its own against time, no different than the time and money I invest in my kith and kin.