I feel like the more important takeaway is that soap makes water a better solvent for washing and hygiene, not necessarily that soap destroys viruses. Also, water that cells can't keep in or out or that sticks to the wrong things can't be used!
Manually washing your hands with regular water eventually has the same degree of efficacy as with soapy water, it just takes a lot longer, so why don't more people conclude that they just need to drink more water to flush the viruses out when they're sick? Why should it be the soap plus the water that makes it magic?
By and large, you want to prevent the contamination that leads to viral infections by keeping the parts of you (or others) that interact with the environment away from the parts of you (or others) that viruses enter through. Because we can't do that all day, every day, we try to lower the odds of anything that might've gotten on us staying on us intact, and soapy water applied and rinsed at a sink is a pretty good way to do that.
Once the viruses are inside us, they're in the cells, and soapy water doesn't have the right properties that our cells and tissues need to maintain an environment that allows them function, largely for the same reasons it's good for cleaning. The biology of life relies on these properties universally, which is why we can't drink salt water or water that's "too pure" like deionized water; one takes water out of our cells, and other puts too much in.