While I get some people use blocking willy-nilly or to get the last word, it's something that should be respected. If someone doesn't want to interact with you, just leave them alone. Bypassing a block would be a surefire way to catch a flag anyway, one that may invariably breadcrumb back to the IMVUMafias if you're using a non-Mafias client.
I get it, sometimes people annoy you, or you really care about someone and just want to explain something or say sorry. But it's better to respect people's privacy and choices. Besides, breaching that falls into harassment territory; just isn't worth it or morally sound.