However, some people will say that is a bad thing and others will say it is a good thing. Both those things can be said to be true.
I'd say those were opinions, not truth or lies.
However, regarding immigration for example, some people will highlight things like changing cultures, or pressure on services, and conclude it's a bad thing. Others will highlight that immigrants can bring skills and fulfill empty jobs, and conclude it's a good thing.
Both sides give different weights to facts to conclude different things. Immigration being good or bad may be true individually for each of those people, depending on their experience, I suppose.
Governments have to work on what is best overall for their countries, though.