But as the Swiss vote suggests, European governments may find it hard to resist populist calls for a tit-for-tat approach unless they take a leaf from America's book and a draw up a simple, transparent set of legal rules for all faiths.
For the campaign tit-for-tat, at the purely political level, I refer you to the campaigns.
The United States and China have exchanged accusations of dumping for years and imposed tit-for-tat duties.
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For once, the attacks have not set off tit-for-tat accusations between the Afghan and Pakistani governments, as both countries deal with the extremists working to keep girls from getting an education.
"For the first time, we are getting into a tit-for-tat syndrome, " he said.
And it would do so without embroiling us in a bitter tit-for-tat trade war with China.
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The speculation on the street is that it was a tit-for-tat assassination between rival gangs.
The tit-for-tat continues a running battle between the president and the powerful gun lobby.
Elsewhere in Syria, a grim tit-for-tat of pinprick rebel assaults and indiscriminate retaliatory bombardment continues.
In the 1930s, the Smoot-Hawley tariff provoked tit-for-tat responses and a collapse of world trade.
Courts in 10 countries have been asked to adjudicate an apparently tit-for-tat series of intellectual property claims.
The nuclear-armed neighbors were involved in a tit-for-tat recriminations over deaths of soldiers on the border in January.
There is a regular tit-for-tat exchange between the governments of Peru and Bolivia based on their political differences.
The two companies continue to play tit-for-tat with their patents around the world.
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By describing the coalition agreement as a purely contractual affair, Mr Clegg inaugurated a new era of tit-for-tat politicking.
Tehran said Wednesday it was temporarily recalling its ambassador from London, another move in escalating tit-for-tat gestures between the governments.
Adarsh Sinha of Barclays Capital thinks the Swiss move will not be the start of a tit-for-tat round of devaluations.
One social media expert told the BBC that the tit-for-tat action had been motivated by Instagram's desire to make money.
If tit-for-tat violence among paramilitaries does set in, getting the political process back on the road will become even harder.
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Meanwhile, Iranian Foreign minister Manouchehr Mottaki confirmed Tehran was looking at relations with the UK following the tit-for-tat diplomatic expulsions.
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On Monday, that couldn't be avoided, but Israeli officials sought to play down speculation that Iran was engaging in tit-for-tat revenge.
Exhausting negotiations via Egypt finally fixed a six-month truce with Israel, after months of tit-for-tat attacks amid an ever-tightening Israeli blockade.
Since this latest round of internal fighting erupted we've seen a series of tit-for-tat kidnappings, including one last night of a senior Fatah official.
Fears that the Japanese might resort to a tit-for-tat devaluation of the yen to boost exports have contributed to currency devaluations elsewhere.
Even worse would be an associated tit-for-tat trade battle between the rich.
Tit-for-tat killings in Homs by Sunnis and Alawites have been reported.
Your report states that there was tit-for-tat violence, but the reality is that it was fairly quiet in the city at the time.
Those who sent the terrorists to attack America would be only too pleased to absorb a less than tit-for-tat cruise missile attack in response.
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The two countries have twice veered close to war since tit-for-tat nuclear tests in 1998 - over Kashmir in 1999 and again in 2002.
Further rounds of tit-for-tat killings would certainly make progress much harder.
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