It is harmful to the lender, since when he needs to take out a loan he becomes a victim of the same (kind of) plunder.
Do you therefore want trade not to be free? Do you therefore want it to be carried out under the influence of oppression?
No, economists do not think that we are in the best of all worlds, as they are reproached for doing.
You have to choose between partial plunder, universal plunder, and no plunder at all. The law can pursue one of these three alternatives only.
No society can exist if respect for the law does not prevail to some degree, but the surest means of ensuring that laws are respected is for them to be worthy of respect.