Generally I think it is most fair to place the larger slice of blame on the one who originally presents the opportunity. These entities also tend to try and be

Generally I think it is most fair to place the larger slice of blame on the one who originally presents the opportunity. These entities also tend to try and be opaque about the dubious methods they are using to undercut everyone else. Talk to that building contractor and they will swear that they pay their employees well and responsibly manage all waste. Of course, you still bear the remaining slice of blame since you kinda knew they were lying and went along with it anyway.