Whether or not the survey response means they support Daesh, I would still be concerned that they even have a somewhat positive view of that bunch of evil motherfuckers. Someone that has an even slightly positive view of Daesh is not someone I want to be around.
I agree with you, but you and I are not running for our lives, so we might have a different perspective on the world than they do.
In the Western world of the 1930s, many intellectuals were communists. It seems kind of stupid to us today, but there was a large body of thinking that liberal democracy was fragile, and wouldn't survive the economic crisis. Many European countries, in particular, were losing their new republican democracies, and were either going fascist or communist. If you honestly believed that this was going to happen, and you had to pick one of the two sides, communism was an understandable choice.
Suppose you're fleeing the Ba'athist regime. The alternative, staying, may mean that you will probably get drafted to drop barrel bombs on your fellow citizens, flattening entire city blocks in the vain hope of killing a few rebels who are probably underground. (Even Syrians who don't mind Assad that much generally don't want to do that.) Russia is on Assad's side, and the US isn't doing anything. The only group opposing Assad is ISIS.
Is it so unreasonable for you, in that situation, to say "well, I don't like ISIS, but at least they're actually doing something about the brutal dictatorship"? Remember, when pressed on why they have a mildly positive view towards ISIS, the number one cited reason by Syrian refugees isn't their religious ideology or their humanitarian policy, but their "military achievements".
History is full of instances of bad regimes being overthrown only to be replaced by bad regimes. Hell, it happened in France; Paris gave the world the word "terror" to refer to this kind of political violence. It rarely turns out well in the near term. Nonetheless, you don't know what you'd do in that situation and neither do I, because neither of us have done it.
ISIS are sick, evil bastards, who would be a bad joke if they weren't slaughtering, raping, and enslaving so many people. They are also fighting equally brutal dictators. Many of the people who have tried to escape that world are finding themselves in countries which have a racist level of distrust towards them. If you had nothing, and honestly felt that nobody in the world was on your side, you might have a mildly positive attitude towards some bad people too.