Earlier quoted context omitted.
Posts about unions on HN always skew towards negativity because in the US, unions are seen as bad. (Well done corporate america for that PR coup!) They often can't see the benefits, which are often large and numerous.
Unions in the US are bad, in large part because of laws written to force things that way. Unions in Europe work different, but we legally cannot have that type of union so there is no point in discussing how unions don't have to be bad.
Some are bad, sure. Some unions here in the UK are bad too, but the general principle that unions work to protect workers is indisputable.