I think it probably is a bit of a lightning rod for discontent. That tends to be how these things go. The scale is unsettling.
Like you, I feel like immigration has been terribly managed for years, propping up the GDP to the net benefit of the country but leaving the least resourced people in the country to pick up the consequences.
And I wish that reasoned debates about the subject was enough to make an intervention and impact on government policy. That's my preference. Not a crowd of pissed off disenfranchised voices led by thugs. But that's where we are at now, apparently.