I can see it, but then I am now looking for it. Whether I would have noticed it before it got all this attention I am not so sure. Before it was pointed out I had no idea of the connection and it might well have just passed me by as just another irrelevant feature. It doesn’t look particularly threatening or offensive on its own. It’s the symbolism behind it which is and if that’s unknown then you won’t make a connection.
I am not inside Lineker’s head or aware or how he retweets. Some do so very swiftly without studying the content or its source thoroughly.
For someone like Lineker, in his current position, it would be foolish not to take very great care which is why he probably relishes being freed from those chains.
So yes it should be condemned. He either didn’t take enough care, or noticed and still posted. Neither acceptable. As he has acknowledged.