After they died this way, what next? You are out of weapons now.

Do you recruit more DF channelers as your weapon? Should you convert non-DF to DF so you can bind them as weapons? Why bother with DF, you can be like seanchan and bind regular channelers using the Oath Rod and turn them into regular OP weapon. Or why not just turn them into personal army for your own glory and becomes the Army of Night, or why not just form a new BA so you can rule the world forever?

If you want people as your weapons, you MUST not treat them as expendable tools. It is evil. If the weapons know they will die and thrown away by you, they will just strike at you from the start, since they would die any way.

I thought our society has advanced enough so that veterns are not thought as mindless killing machines, but needs to integrated as part of society.

You treat criminals as criminals, and soldiers as soldiers. You treat soldiers with much more passion, and care. If you want the criminals to redeem themselves, and turn them into soldiers, you must treat them like regular soldiers and put as much care and passion into them as you would for regular soldiers. There is no half-way around it.