The EU turns a blind eye to Muslim supremacists in every country in Europe and backed Izetbegovic and his Islamists in the 1990’s (along with NATO and the US).
Maybe they should have such leverage, but they won’t use it because it’s not politically correct.
Maybe you’re both right, but when it comes to building some sort of base camp, that’s quite a bit different than scattered small groups of potential jihadis here and there.