The fact that Lib Dems are in government is more of a reflection on how flawed our voting system is. Nick Clegg (who came out and praised all muslims after Rigby's death the other day) is the luckiest man alive. He shouldn't be anywhere near government.
why exactly do you feel it is dangerous territory? The local election results have hit Labour and Conservative hard enough for them to re-think their approach to certain policies and watching them all scuttle around now finding ways to talk about their own immigration policies, IMO, is good for the country.
It may only be a protest vote for some, but it has the country/politicians talking about issues that the British people are concerned about.