My guess is there's too much money on the table for those in the western establishment (corporate media and government) to call a spade a spade. If official criticism of China becomes too strong then the public might start asking for the sort of economic sanctions that would hurt western business interests as well. Basically, a manifestation of that old theory about international trade preempting wars.
There have definitely been signs of serious disquiet amongst the western business community; earlier this month the European Chamber of Commerce in Shanghai sent an open letter saying in the usual diplomatese "this can't go on, it's a serious problem." [1] The Japanese did something similar. [2]
This is not out of humanitarian interest. It's starting to affect business very significantly.
Some in the west certainly have labelled it that. There's quite a number of humanitarian crises going on at the moment, as have been over the past few years (and basically forever). Western leaders don't get up in the morning and recite lists of them.
The lockdowns might be useful from a strategic perspective for western leaders (ie undermining faith in Chinese leadership within Shanghai residents), while also actively calling it a humanitarian crisis would hurt the relationship with China which is already extremely fragile because of Russia/Ukraine (ie official criticism of the Chinese government may result in additional support for Russia).