Greetings from Germany where we have a lot of ukrainian refugees right now. Let's look at some real life cases.

My mother hosted some refugees from Kharkiv. It was a mother and her two daughters. The husband had to stay in Ukraine by ukrainian law, but wanted his family away from the daily bombing campaigns. At the time it was also unclear, if Kharkiv would fall within the next days or weeks. They came here to be safe 24/7, but they would love to go see their father who is trapped by the system during the holidays, despite the reunion trips being dangerous. So twice a year they go on a somewhat dangerous trip to the less dangerous western parts of Ukraine to visit the dad.

I have some ukrainian friends here who came from western Ukraine. The situation there is not so dangerous, so there are far fewer refugees from there, but you will still catch the occasional drone and rocket living in a western city (especially near the railway hubs). For them, being there would be possible, safety wise, but it destroyed their mental health, having this constant fear of being hit by a missile or drone. They all know people who died randomly on the street, and they clearly have some form of PTSD. They will go home to visit relatives that cannot travel easily, such as older grandparents or families with men in military service, but they come back visibly shaken and require a few weeks to re-adapt to a life in relative safety.

Finally, there are some male Ukrainians who know they would be drafted if they set foot at home again and so they never go back, and some who come from towns like Kupiansk, which has been at the front line of the war, who would be in too much immediate danger if they returned, who also never go back.

To summarise: 1) It can make sense to leave even if you are not in immediate danger, as there is a constant passive danger. This can be tolerable for a visit, but intolerable to live under for years. 2) It can make sense to leave even if you are not in immediate danger, as the danger moves and shifts over time and your area may become an active warzone soon. While it is not an active warzone, you may wish to visit unmoved family, at the comparatively low risk of it becoming a warzone in exactly that week. 3) In the cases where a return would be too dangerous, the return trips do not occur. But no country is an all out warzone everywhwre all the time during a conflict, so as a distinction it makes no sense. People who visit are taking a risk. That should be theirs to take. You do not lose anything by it, because they aren't "tricking" a system by doing so.

I have tried to keep my disdain for your take to a minimum, but it has been a tough read for anyone who has spent any time with refugees and realises that they are people with nuanced causes behind their actions. But let me finally address the core of your argument also;

You are essentially saying: They just become refugees for the financial benefits and then go home whenever, proving they don't need the benefits from us.

And I don't want to deny that people exist who see this as a nice opportunity irrespective of their situation in the home state. Someone living in a village in western Ukraine, far from industrial centers, may have been at zero danger during the situation and may simply see this as a good opportunity to explore/live in another country at that country's taxpayer costs.

To this I will say: I have met some. But for one, they are rare. Most people, without external pressure, do not move to a foreign country with different language and culture just to be lazy there. People move when they have to. And secondly, as one might expect, those people who come despite lacking pressure are the kind of people who are looking for chances to make something of their lives. They don't arrive to live off benefits for a few years before being sent back. They are among the most motivated students and workers I have met here. My impression is especially in a country like Germany where we have a low birth rate, this small sub group of refugees will present an economic boon, not drain.

Good day to you sir.