Is it not equally insane to completely trust your senses? We know how they can be tricked fairly easily. Like I said before, that's one of the reasons why real science always has the caveat of "as far as we know", unwritten at the end of every discovery.
At the end of the day, you don't know, for sure, with 100% certainty, that you're not a brain in a jar. Or more statistically likely, a brain popping into existence after the universe ended and then popping out again. (An actual scientific theory backed up by the math which is wild). You simply don't. All of your existence could be a lie. You just have to make the best guess you can with what info you've got and hope you're correct. Science is very, very good at guessing within the parameters of the information we can observe, but it's always assuming what we are observing is true.
It's like, you're, idk, sitting in a cave, and like, you're watching these shadows on this wall. You can't turn around and look at what is making these shadows, so you're doing your best at guessing, like, what the heck is actually making these shadows. Something like that.