According to Time, The Observer, and David Cameron, "we" are at war with IS. This is debated, but if you consider the murder of 30 British tourists in Tunisia by an IS gunman provocative, and if you believe the news reports that 7 major attacks on British soil were foiled this year alone - and that one is pending any moment - you might think that IS was attacking UK interests.
At any rate, the decision facing the British Parliament this week is - bomb Raqqa in Syria, or not. As is widely known, Labour is divided on this issue, and some Lib Dems and SNP are also unsure it is a wise move, as well as a few Tories; Canada and Australia are not currently bombing Syria, it should be noted. Russia, Turkey, and France, however are, along with the USA.
Mr Corbyn's pacifist leanings are not 'terrorist sympathising' despite what the British Prime Minister has said - it is honourable to question going to war. Furthermore, Britain could and should take far more refugees from Syria, and develop cultural, political, economic and strategic plans for replacing bankrupt leaders and ideologies in the region with those more rational and less fanatical, while respecting the culture and beliefs of the Middle East, and its complex histories and own needs.