Did you ever try to see it from the other side's view? If you consistently leave a dirty spot, then of course the response is always the same.

In this particular case, yes, you can say, "It's the bloody manufacturers, it's their fault, they are bloody cowards and do not want to risk anything".
Or you can say, "We have so far failed to persuade the manufactures to try our alternative, where have we made mistakes and how can we alleviate them?"

Which one is more constructive?