I’ve often been the only person in the room willing to confront things directly. (I don’t like doing it but unresolved issues just get worse.)
What a person says about people who are not there is telling.
When it’s not outright malicious, it’s usually fear. It’s something they don’t want to happen that stops them from saying it. (Depending on the situation it may be entirely justified.)
Kindness does exist. There’s plenty of times you don’t want to upset somebody else for their sake.
There’s nothing wrong with conflict avoidance being the default. It only becomes a problem when it stops you from conflict where it’s necessary.