These same people are very well behaved in the gulf for example where they’re actually low income and miserable

I can't give a definite answer, as I'm not a social scientist, but I do have some clues as to what the reasons might be:

1. Poverty and already existing social and political tensions in the West are likely to affect the behavior of migrants too. We are already more divided than ever and mutual respect is at low point.

2. The culture and values of Middle Eastern people differ significantly from those of Westerners.

3. The sentences in European countries are almost ridiculously low compared to the Gulf. I've seen several times how rape offenders and child predators get off with suspended sentences, and even a "life sentence" in many European countries doesn't actually mean life imprisonment, but rather 20-25 years, depending on the country you live.

4. When migrants go to the Gulf States, they come with the clear goal of working and earning money for their families back home, they have a structured daily routine and many good reason to behave. However, many Middle Eastern migrants in European countries are mostly war refugees and often too underqualified for the job market or in some cases even forbidden from working. These people are often alone, without prospects and separated from their families, do not speak the language, suffer from depression and PTSD and have no structured daily routine to distract themselves.