Much as we may dislike the fact, the results from quantum physics are unequivocal: parallel universes do exist. Schrödinger’s cat is both alive and dead, at the same time, while it exists as a probability distribution, which is resolved into either a live cat or a dead one by the act of opening the box and observing it. But until the observation is made, both parallel universes can be said to exist, and there is no way for us to know which one of them we inhabit.
Quantum effects dominate in the micro realm of subatomic particles. For instance, the laptop on which I am typing this contains millions of transistors which are created by implanting ions into silicon substrates to create patches with built-in electric fields and interconnecting these patches with etched aluminum wiring. Each transistor relies on the phenomenon of quantum tunneling: while in normal physics it is impossible for an electron to find itself on the wrong side of a built-in electric field, in quantum physics the electron is a probability distribution, not a particle, and quantum tunneling works reliably enough to support the entire electronics industry. But if you scale your circuit up, the chance of a pickup truck successfully “tunneling” through a brick wall becomes too minuscule to be of practical interest. It is still possible, but it would take anywhere between right now and several lifetimes of the universe hence to observe that result.
Oddly enough, such quantum effects are quite normal to observe within the political space. Here the physical objects involved are far too large to give rise to the parallel universes of quantum physics, but the narratives they give rise to are not. This is because the narratives are a matter of perception, and there can be historical periods, such as the present one, when the peephole through which the political establishment and the mainstream media allow us to see the world becomes so tiny that it becomes a toss-up as to whether or not any given photon will manage to find its way through it.