I was on a flight just last night leaving LAX on which two adult passengers decided - 5 minutes after leaving the gate, before we got to the runway - that they

I was on a flight just last night leaving LAX on which two adult passengers decided - 5 minutes after leaving the gate, before we got to the runway - that they would take off their masks and refuse to put them back on. The plane returned to the gate, a security agent came on board, removed them (no force needed). Then we had to confirm their baggage was off the plane, get new paperwork, push back again, adjust takeoff slot, etc. We wasted 40 minutes of time for the ~100 people on the plane. Some may have missed connecting flights. While I don't think a lifetime ban from civil aviation is warranted, I think a significant fine and a temporary ban would be appropriate.