"we don't need to prove the 2020 election was stolen, it's implied because trump had bigger crowds at his rallies!" -90% of trump supporters
Another good example is the Monty Hall "paradox" where 99% of people are going to incorrectly tell you the chance is 50% because they took math and that's how it works.
Just because something seems obvious to you doesn't mean it is correct. Always a good idea to test your hypothesis.