That isn't true? Is there proof for that assertion?
Before it is repeated again, no I don't think temporary accommodation before being removed from the country is social welfare. Regardless of the issue at hand these folks are still human beings and deserve to be treated as such. It's in no way comparable to being paid Universal Credit or getting a council flat, those benefits aren't available to these folks due to the fact that they aren't legally entitled to it.
Do you really believe these folks are coming here after weeks or months of travelling just to get a bed and substandard food for a few weeks/months with minimal (if at all) prospect of remaining here (likely after paying criminals an exorbitant sum for the pleasure)? Perhaps they've been lied to and think otherwise, but it's a frankly ridiculous motivation for us to treat these people with less respect than we currently treat our worst citizens.
Which is why they should always have been returned to their last destination when picked up which would have deterred others from following. Once they claim asylum they're not considered illegal whilst there application is being processed though are they? So whilst they're application is being processed they're not all being held in migrant camps, aren't they in social housing with minimal prospects of legal work and instead receive a small allowance?