I understand your reaction. As i said, i deeply dislike that they used that image. But it is one brief moment in an otherwise good video. I think that you should give the channel another chance and hear out a few more of their videos so that you can form a more complete opinion. If you still feel iffy about them then it's absolutely your prerogative to say that you are uncomfortable with them as a source. But i think that they at least deserve a fair chance.