because i'm familiar with his policies.
when i first asked you to define socialism, and you gave the definition of democratic socialism, that definition provided for a socially owned economy (ergo, no capitalism, no private ventures, etc). and yet if you look at what bernie is advocating for, that's not it.
so he's not a pure socialist by the very definition you posted. he's just a lot closer to the socialist end of the spectrum that just about any other major politician in this country, so him calling himself a socialist is relative.
i mean, if you look up a definition of capitalism, it will say that that industry and trade are controlled by the private sector, and not the state. and yet we know that is not an entirely accurate definition of the current US. so anybody who says they are a capitalist but dont want to abolish medicare, social security, minimum wages, etc is also being inaccurate if you are going to be nitpicky
so if we're not capitalist, and we're not socialist, what are we? or you just stop being dense for a second and consider that we are somewhere on a spectrum.