Not sure what you mean by left wing ideology in the context of foreign policy? Can you clarify?
A good number of the people on the Left are easily suaded by the pictures being played out on TV about the Palestinians getting pummelled by Israeli forces. Their natural inclination to abhor such tragedy leads them to condemn Israel for such devastation. The problem with that is that Hamas deliberately places its fighters among the population to insure maximum casualties, and then uses that to get an outpouring of international outcry. Little consideration is given from the Left to the fact that the Palestinians have been at war with Israel since 1948, and during those intervening years, they have never signed a peace treaty, and have always chosen their leaders that publicly shouted the destruction of the state of Israel. What is loss in that cacophony is Israel's right to defend. The road blocks, the wall, the blockades, the bombings, the incursion into the Palestinians, and even the occupation of certain parts are all measures taken as a response to this seemingly unending war. Yet, you don't see equal coverage of those facts. And when certain people do defend Israel, they are quickly dismissed because, because, well you know, the Jews control the media, the Jews control the US government, the Jewish lobby is all powerful, blah, blah, blah... And that kind of vitriol comes mainly from the Left. When dealing with thugs, pleading for the poor is not the appropriate response. The thugs need to be ridden of. The Left wants strong government as that is the best way to fight inequality, have programs to help those in need. Strong government under democracy is fine. It isn't when a country has no inclination to go the democratic path and are run by thugs.