If for some reason Kaczyński had been put on a dissident case, he would undoubtedly have refused outright or would have pulled an Italian strike or some other delaying or sabotaging tactic.
Prosecutors in Poland, as in most countries, swear an oath to uphold and defend the law without favour. They are strictly forbidden from refusing to uphold the law; for example a fundamentalist Mormon would not be allowed to refuse to prosecute a bigamist on the grounds that his religion says bigamy is just fine. So Chairman Kaczynski either intended to break his oath (something of which there is no evidence at all) or to prosecute dissidents (something evidenced by him volunteering for a job which required people to do that).
all you know about PRL is what soft-on-commies people of Michnik's ilk have written.
No, I also know what the paid shills of the PZPR wrote about it, which is remarkably similar to what the paid shills of PIS write about the Poland which some people call the PiSlamic State.
Anyway, anybody else noticed the disgusting actions of Ziobro, taking revenge on a judge for ruling against him in a defamation case two years ago by sacking her due to a grand total of zero complaints being filed against her?