still means "because" in this sentence. means "simply because those who follow him of their own will are not inconvenient/bothersome (to him)". The second after is contrastive (i.e., the followers are at least harmless, if not helpful)
"simply in order to avoid inconvenience" would be "()", "()", "()", etc.
modifies and means "on one's own", "without asking/permission", etc.