I contend that they are both inherently valid, in a manner of speaking.

The Arminian belief is founded on the human perspective, shaped by their own lived experiences, while Calvinism adheres to a bird’s-eye viewpoint, a celestial outlook based on what lies beyond this mortal existence.
Arminianism holds scripture close to their heart, as do Calvinists, both with their vision on the Scriptural Revelations of God’s Word but from different angles.
One’s perception varies according to the vantage point.
The diversity of perspectives regarding the concept of Heavenly matters will always give rise to conflicting interpretations, but they aren’t always conflicting when analyzed deeper. (Sometimes they are.)
Matter can never fully grasp the Spiritual from it’s material form, as we are made of matter.

This war between Calvinism and Arminianism can be likened to observing a building from multiple vantage points, such as inside and outside or from an aerial view versus a ground-level perspective.
While each observer may view the same physical structure, their respective viewpoints may lead to distinctly different understandings of the building description of the building.
Then we fight over perspective because we lack enough perspective on both sides; to understand that we don’t see from the same position.

It’s sad many won’t recognize that despite these differences, many of our interpretations are grounded in the same underlying Structure, God’s Word.

The problem lies in the tendency to condemn those with differing perspectives as heretical: it’s a sign that one lacks Grace.

With a Spirit of Grace and understanding, we will give Grace to others who may be in error, and correct them only to build, not tear down.