If you are doing something and refuse to meet with the hounders, they assume you wish to continue and label it "unrepentant". If you are not doing something and refuse to meet with the hounders, they assume you are hiding your "conduct" and will also label it "unrepentant". And all it takes is one person to snitch on you (except child molesters, which require two to snitch). One person thinking it was you buying a Christmas tree or seeing you getting something that looked like Christmas ornaments or other banned items has a "duty" to report it to the hounders. If they do not, they are viewed as being in on the "offense". At which point, the hounders will have an investigation.
At this point, if you refuse to participate in such investigation, they will label it as "brazen conduct". They will also assume you did whatever was responsible for the hearing, plus refusing to cooperate with the investigation. Even if you didn't do the original "offense", you did the "obstruction of the investigation", and will be disfellowshipped for that.