Why is ugly appealing?
“Brutalist architecture is a style of architecture which flourished from the 1950s to the mid 1970s, spawned from the modernist architectural movement. Examples are typically very linear, fortresslike and blockish, often with a predominance of concrete construction. Initially the style came about for government buildings, low-rent housing and shopping centers in order to create functional structures at a low cost, but eventually designers adopted the look for other uses such as college buildings”.
The appeal of the Brutalist and other types of fortress like aesthetics at the moment can be seen as a need for protection from the outside volatile world.