The issue is about tackling IS at home. How do you tackle them abroad without intervening in sovereign countries and unsettling a region, like we have been doing, without any success? IS are not a state, they are not really anything tangible. It is a concept, an ideology.
We're working with the Iraqi army. It's not as though we're intervening where we're not wanted.
Listen to a single thing the Kurds and/or an Iraqi general says and it's easy to realise the part we can play.