It is getting more and more embarrassing these days to be a witless. The more mainstream Christian denominations realize that the witlesses do not teach what the Bible actually teaches. And the "unchurched" realize that evangelism is a waste of time.
And both groups are seeing more bad fruits of the witlesses. Children being molested and then silenced is becoming more common knowledge these days. Every so often, you see something that would be more to be expected from some extremist Muslim than a reasonable Christian--including acts of violence against the family or neighborhood. More frequently, you see the witlesses doing nothing of value for the community despite proclaiming to do a charitable work. Children are denied proper education (mostly because they are kept up late on school nights for a boasting session, frequently on test nights). They claim to respect the earth, then they waste resources and pollute stupidly. Within the past year or so, they have been printing rubbish that borders on outright hate crime (and often fits together when several different articles a few months apart are fitted together, such as the "mentally diseased" article along with "We would kill apostates if it was legal to do so" in a later article). Discrepancies between what the public is told and what the members are told are common.
Additionally, what is there to lose if one discloses oneself as a witless? They are seen as pests in the community. That means, if they are in business, their business will go down. Reputation in the community becomes one of being willing to endure any sort of rubbish from people without recourse, and people will trample on them. They are supposed to be exemplary in every way. To me, that is enough to be embarrassed to be a witless.