Why should employees pay social security separately when they are hospitalized?

The unit shirked its responsibility. If medical insurance is paid by the unit, that is, the unit and the individual pay the same. In this way, the part paid by the unit and the part paid by the individual shall be paid according to a certain proportion of the average monthly salary of the individual in the previous year. If the unit does not undertake social security, it is unreasonable to evade responsibility.