I do not believe that if something is voluntarily done makes it 'no harm'. Lot of missionaries hide the 'mission to convert' in the name of 'voluntary'. People are made to believe that one religion is better than other so they can "voluntarily" choose. IF they don't, possibly the help will be denied.
I am not saying every voluntary act or mission is like that...but point to your article, is that, there are malicious deceitful things that happen behind the 'voluntary' curtains.
Indeed, the veil of "good" that evil hides behind. I wrote a post about that ;)
There are missions that compel the hungry to listen to a sermon (over the growling in their stomachs) before getting a meal.
I note that I can go at least a month without food. I can walk a long ways away from those 'missions' in a month.
My point exactly, hunger is a bigger threat than a gun pointed on your head...and under duress of hunger - people generally do anything!
Opinion.
Sound opinion, imho. The Holodomor exemplifies your statement well. Indeed, the bulk of the 65 million+ people murdered by the Bolsheviks were killed by starvation, rather than physical assault.
Unfortunately those victims were prevented from just walking somewhere there was food.