Why is Social Security taxed?

As I approach my sixties and I see what gets taxed on my parents’ tax return, I am wondering why all Social Security benefits individuals receive in retirement are subject to tax? When looking at other forms of retirement income there is an incongruity.

If we are trying to simplify the tax code, Social Security benefit taxation is another area we should make a change. If you agree with my article, please use the contents to write to your congressman/congresswoman.

https://medium.com/@ron_66571/why-is-social-security-income-taxed-22e011a5d759