The witlesses think they have the monopoly on being persecuted for righteousness' sake. They agree that others are persecuted, but for evil doing. Hence, you see non-witlesses being persecuted "for nothing". People get persecuted for atheism or Devil worship (in the Bible Belt, or during the First Dark Ages), but that was not for righteousness sake. People in other religions get persecuted "for evil doing" if they are Christians in a Muslim country, or they are Muslims or Hindus in a predominately Christian world. But, none of that is portrayed as being for righteousness' sake.
Fact is, many witlesses are being persecuted, not because of righteousness, but because they are blatantly wrong. Persecution because of righteousness is a result of being seen as a threat to the Establishment--and the witlesses do not do that. Rather, they coerce children to die on the blood issue, even making up terms like "mature minors". They force people to suffer because they are not allowed to carry a stupid card. They impose rules against defensive use of force (such as fighting to defend one's country). Plus, they ruin children's lives with no fun. All for an undefendable belief system--hardly for righteousness' sake.
And, just wait until they have to start defending "a generation" as "the group of people whose lives intersect with those who saw the beginning in 1914". They are going to have a miserable time with that one--especially if they try and use the scripture to back it up. They are going to be persecuted because that one is blatantly wrong. For sure, that does not constitute a threat to the Establishment.