Europe

"immigration bad" is easier to attach scary numbers and stoke up fear.

It's easier to have the media cycle showing bad things immigrants do (which - imo - is likely statistically inline with the general population. But because it was an immigrant that did it, it has extra biases attached), than feel good stories of how immigration helps a country & economy.

The fact that immigration is generally a net positive is hard to describe in soundbites and catchy headlines.

So the right makes scary statements and flashes scary numbers and promises to do something about it. And it's difficult to nail down exactly what they are going to do about it.
And, of course, that single issue party doesn't run the government for the people so you end up with a bunch of bullshit harmful policies being enacted.
It ends up being the message of the policy that drives the news cycle, not the policies themselves.

While more progressive parties talk about equal rights, better taxation, more social services. And everyone talks about money trees or politicises medical issues.
So it's the policy that gets raked over the coals, instead of the message of the policy being the story.

And finally, the majority of news companies are owned/run by right wing (or at least right leaning) millionaires/billionaires.