Number of lives lost is insignificant, both for Thailand as well as worldwide. Similar numbers of people die from road accidents, smoking or drinking related diseases and other.
Every year 55 mio people die worldwide. At peak, there were 15 k death with (not from!) Covid daily, which makes 5 mio per year, which would be a 10% increase. However many of them would have died from something else anyway, so the real increase of mortality is lower than 10% and probably just above statistical noise.
Before the current outbreak in Thailand, there were more death from suicide for economical problems (due to Covid) than Covid.
This is a clear case where the remedy (lockdown, travel restrictions, limitation of social activities) is worse than the disease.