https://foreignpolicy.com/2020/12/22/sweden-coronavirus-covid-response/
Your sole outlier, Sweden, is crumbling.
Seatbelts lose efficacy if not properly worn either. And yet no one is advocating for their removal.
The problem with your argument is that you're saying that if some people are doing harm to themselves by not properly protecting themselves, then there's no point in doing it at all. That's wrong.
If someone is foolish enough to not wash or replace their masks on a regular basis, then the only person they're hurting, is themselves. That isn't even the primary reason for wearing masks. It's to protect others. Dirty or clean, that person's mask is still functioning as a barrier to transmitting the virus to others. So it's still doing its job.
And I actually do change my mask, multiple times a day actually. I only wear disposable 3 ply surgical masks so that I don't have to worry about washing or cleaning them.
And I love how you keep pointing to your numbers. Every pandemic starts with low numbers. At one time, Cholera, Smallpox, and the Spanish Flu only infected and/or killed a small percentage of people too.
And if you really believe what you're saying, walk into your nearest ICU and tell all of the doctors and nurses there that "influenza happens". See how that works out for ya.
BTW, influenza and corona are 2 entirely different viruses. Oops.