The posts would be there to resist in plane of wall forces ie pushing from the end edges of the wall. So wind pressure on the wall that is 90 degrees to one of the walls. Or seismic forces. Also, properly set against the column, the mortared block would resist wind pressure directly hitting the wall face due to a pinching effect between the column face and the block end face.
is rhe steel frame supporting the roof frame independent of the walls? Or is the roof frame resting on the walls ?
The columns on both sides of a door are there to provide a secure anchor for the door hinge and to transfer vertical load from the lintel over the door opening.
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