As discussed here many times more refugees do stay in the first country they arrive in than continue their journey onwards. However, we also see cases where people first arrive in a country such as Greece or Italy and initially do try to settle there, then, due to overstretched infrastructure and work shortages it becomes impossible for them to survive and they end up destitute in the street. Some therefore decide to move on to France, or further, due to a desire to become independent and contribute to society. In the long term this will benefit both the refugee and the host country.
The current scale of the refugee crisis means that if all refugees applied for asylum in the first European country they arrived in, the generally poorer peripheral countries would not be able to cope, which would only make the crisis worse for the whole continent ultimately.
Refugees who have lost everything due to war or persecution face a daunting task in trying to rebuild their lives. Ask yourself, “If I had to suddenly leave home and everything behind me tomorrow, arriving to a new country without shelter and without work, which country would I go to and why?”
The number one reason we hear for refugees continuing their journey to the UK is that they have family ties here. In fact, this covers at least 50% of cases(1). Family ties run deep, especially when you have lost everything else.
Other factors that people will take into account are more practical, for example if you speak the language you have more chance of being able to find a job and you can navigate everyday tasks like understanding public transport or going shopping.
It is also not an uncommon (and a heartening experience) to hear refugees, often those from Africa, talk with respect about how they see the UK as an icon of democracy, justice and freedom.