Yeah, this is just one of the several excuses that periodically comes up and it never holds up to even the slightest scrutiny. For one to even consider the idea that video games are a major cause behind these shootings you'd have to assume that no other country in the world has them since shootings aren't nearly the problem they are in the US.
Politicans need to be called out when they say things that are incorrect.
And people do but with every statement it gets divided between people who say:
Facts prove incorrect statements = The statement is Fake news
Feelings don't want to agree with facts = Facts become Fake news.
If a large group feels a certain way even when facts show they are wrong politicians will still use it to get votes.