You're talking about like six people who played zero role in forming the foundations of Canada.
Again, a mythical, non-existent narrative.
There were 1000s of South Asians who worked in fishing and lumber back in the early 1900s. Same with other ethnic groups.
The act of murder you mention was just political violence, by an activist that happened much later, for which the guy was executed.
They all played a role in building Canada and continue to do so. And yes that includes the TFWs we bring in today.
Granted, the proportion of Caucasians to non-Caucasians has dramatically shifted in the last 100 years.
However, such demographic and cultural evolution is natural.
Trying to freeze Canada at a moment in time in the past, ignoring everything else, and yearning to go back to that, is typical far right brain rot.