An excellent post, and I agree with it completely.I have no allegiance to Man Utd of course, but the focus on Rashford right now is a red herring IMO. Just a story to sell papers.
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More to the point, while Rashford is far from the only dramatically under-performing player at Manchester United just now, nevertheless, (unfortunately), he is presenting - by his behaviour and conduct - (and yes, @timber, you make some very salient points) a very inviting target for public criticism.
Moreover, I am willing to wager that quite a few in Government circles (and the right wing media) have neither forgotten nor forgiven how Rashford compelled the government to reverse their intended policy on school dinners, and, regrettably, his current conduct (no matter how understandable, and @Lord Blackadder makes a very good argument) offers an almost irresistible target.