People with brain and common sense know only citizens can vote, how come those who lack the common sense dont get this?

https://www.yahoo.com/news/trump-mike-johnson-push-redundant-200848395.html
Trump and Mike Johnson push for redundant ban on non-citizens voting

Donald Trump and the House speaker, Mike Johnson, plan to push for a bill to ban non-citizens from voting, the latest step by Republicans to falsely claim migrants are coming to the country and casting ballots.

Voting when a person is not eligible – for instance if they lack US citizenship – is already illegal under federal law. It is unclear what the bill Johnson and the former president will discuss in their Friday press conference at Mar-a-Lago will do to alter that. But it is one more way for the former president to focus on election security and to ding the Biden administration over the situation at the US-Mexico border, a key issue for likely Republican voters this November.

Like the other claims Trump makes about the 2020 election being stolen, the talking point about migrant voting does not have facts to back it up.

There is no evidence of widespread non-citizen voting, nor are there even many examples of individual instances of the practice, despite strenuous efforts in some states to find these cases. A large study by the Brennan Center of the 2016 election found that just 0.0001% of votes across 42 jurisdictions, with 23.5m votes, were suspected to be non-citizens voting, 30 incidents in total.

One review in Georgia found about 1,600 instances of non-citizens registering to vote from 1997 to 2022. In these instances, safeguards in the process worked: none of these attempts led to someone being allowed to register, because they did not submit proof of citizenship needed to be added to the voter rolls.

The Heritage Foundation, a conservative thinktank, has a database of voter fraud cases across the country, which, according to the Washington Post, includes just 85 cases of non-citizen voting since 2002.

People with brain and common sense know only citizens can vote, how come those who lack the common sense dont get this?
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