While I (too) consider the issue over foxes should not be anywhere near top of the list, it's the type of thing which means the Conservatives can end up on the wrong end of voters' opinion.
You only have to watch the Eddie Izzard video clip to see that it is a big enough issue to be mocked, and about half way through (1m 35s or so) he talks about "Thatcher's children"... "they'd take us back to 3m unemployed, 15% interest rates, tax cuts for the rich, fox hunting and the feudal system, given half a chance"
For all the other problems "in common" between those in the countryside and those in towns, the red coats and ritual of hunting with dogs make it appear a "rich man's pleasure". It's not a "sport" in the way that hockey, snooker, or even polo can be seen as sport, but makes the supporters (esp if they are Conservatives) appear like some of the gun carrying Republicans, and a more than a little dangerous.
The Conservatives brought it up, whether it was as a diversionary tactic or whether they consider it "significant" I don't know, but the sooner they stop talking about it, the sooner people might take note of their other policies. (Hope those against will not forget the idea if they may be tempted to vote tactically... if it is a manifesto item it will not be forgotten completely by the party.)
While they continue to highlight it, they do themselves no favours.
It would be safest for them to drop it like a hot coal and never return to it, but it's their look-out and all the more reason, in my view, why the old stereotypes of Labour and Conservative will "turn off" so many voters... they cannot get past niggling matters and continue childish "finger pointing" despite promises a long time ago to give up "Punch and Judy" politics.
It seems to me listening to goings on in the Commons, that rather than give straight answers, the front benchers are always after a laugh, always deflecting the question and avoid answering by changing subject (usually to some past blunder of the opposite side) rather than clearly saying what is being done, or what will be done. It's pathetic, it's not clever, and the public are surely sick of it.