I would appreciate it if you actually answered to my post instead of retreating to pure theory-crafting. Still, let's take a look at your claims.
Scenario A - No claim:
Player X and Y are PRs, none claims. Town lynches anyone besides them (if close to lynch they would claim)
Let's just pause here and note that this has not worked well in the past and there is no reason to assume that it will work here.
and scum must kill basically randomly. Later they may decide to claim to gain IC status or force scum to counterclaim which increases the probability of a scum lynch significantly.
First, scum would not force a 1-1 situation if it would actually increase the probability of their team winning. So the counterclaim scenario is bad. Second, look at the bad outcome here - we lynch one of our PRs. If scum claims first, they can out our more powerful PR. So in the bad case scenario, we lynch our most powerful PR, with is something we don't ever want to do.
Scenario B - 1 Claim:
Player X and Y are PRs again. X claims D1. X is an IC but still a PR. Town lynches again anyone besides X and Y and scum kills X. Killing PRs has been the goal for scum anyways, so they are happy that they know X and just take him out.
Let's interject again because ou apparently do not read what I write. X would be the weaker PR. If they lnch them, they guarantee that the stronger PR can get results in. Which matters in a small game. So first off, scum's decision is not that easy.
Town has just lost a PR with a probability of close to 1 for literally no benefit.
Literally wrong, as explained. Not to mention that scum's goal is not only to take out PRs, but also strong players. This may seem harsh, but I'd rather have scum kill a newbie lurker PR than say, gkrieg.