Let me break it down. Please refer to each line you disagree with and explain why (i.e. "#1 is not correct, because..." and etc.).
#1. The rule isn't knew, but aggressive enforcement of it is.
#2. It was common for Canadian PRs to travel, stay for decades out of Canada and return without being grilled and reported at the border.
#3. Not any longer.
#4. (also see #1): Again, the rule is not new, but the aggressive way it's being enforced is something totally new and started during the last decade.
#5. It (aggressive enforcement of RO - JL) also coincided with large influx of immigrants from what used to be called "third world countries".
The following are not undisputed facts, as those stated above, but my conclusions based on facts cited:
...in the context of above stated I perceive it (aggressive enforcement of RO) as manifestation of feudal/slave owner mentality ("now that we started to import "those" people, we need them to clean our toilets and run as rickshaws on the street, so it is time to aggressively enforce the RO, least these PRs go back home and live normal lives. We need them third world country people as slaves/rickshaws here, we can't allow them to lead comfortable , self sufficient lives, here or abroad!"). And that disgusts me.
You may draw different conclusions and believe that the motivation of government is something other than what I believe it is. You are entitled to your opinion, just as I am entitled to mine.