I was initially a critic to the label "islamophobia" since it was used to attack legitime critizism to Islam. Eventually I begun to reconsider. There is an irrational fear of Islam, a fear that goes far beyond simply pointing out the problems with Islam. Islamophobia believes in a real conspiracy where left-wing groups cooperate with Islamists to make Europe (or whatever) into a muslim stronghold. I have encountered this quite alot on popular rightwing forums, where critizism against right-wing extremism is considered "support for Islamism".
I saw a quote a commentator had done that sums this up;
När man dessutom likställer kristendom med den rent luciferiska dödssekten islam - då har man mer eller mindre avslöjat sig som medlöpare till islamisterna, om man inte är islamist själv.
When one equalize Christianity with the Luciferian death-sect Islam - one have more or less revealed oneself as an ally to the islamists, if one isn't islamist