Some Cereals Contain A Chemical Found In Roundup

Why is it that so many foods contain some time of chemical that could give us cancer? They are now saying that certain cereals and cereal bars contain weed killer. It makes you not even want to eat anything for fear you will get sick.
The Environmental Working Group (EWG ) say they found high levels of Glyphosate, the main ingredient in Roundup in 26 out of 28 products: They are saying that it is higher than safe levels? Is it ever safe to have Roundup in your food?

In the meantime, Monsanto, the manufacturer of Roundup, says glyphosate is a probable carcinogen and notes that for 40 years, the EPA has supported the safe and effective use of glyphosate.

Here are the cereals that found traces of the chemical:

Quaker Instant Oatmeal Cinnamon & Spice

Quaker Instant Oatmeal Apples & Cinnamon

Quaker Real Medleys Super Grains Banana Walnut

Quaker Overnight Oats Raisin Walnut & Honey Heaven

Quaker Overnight Oats Unsweetened with Chia Seeds

Quaker Oatmeal Squares Brown Sugar

Quaker Oatmeal Squares Honey Nut

Apple Cinnamon Cheerios

Very Berry Cheerios

Chocolate Cheerios

Frosted Cheerios