/facepalm at you confirming some of the key things I said.   

If the bollards are too far apart then they will use a littler car and go between them.   The bigger vehicle is to deal with taking on the bollards not the building.   

Two thieves generally aim for the door so they don't have to deal with clearing stuff.   If you take away the door completely they will deal with limited amounts of 'clearing stuff' to get at what they want.   They can and would 'create a hole' by ramming the side of the building and backing out or just leave the stolen hole maker in the building while they leave in another vehicle.    The I beam bollard you mention is very easy to get out of the ground with a push/pull and a semi decent chain or strap it's done.  You don't think the front door is the only door on these buildings do you?   Again as you described your bollard it's no more difficult to remove than a basketball backboard post.   In fact it could be easier.