Thailand doesn't (officially) execute drug dealers - that's Singapore.

Whilst Thai law says they can execute drug dealers, this is only to scare the crap out of people. In reality Thailand executes only a handful of people each year and almost all are serious murderers (not sure what criteria they use - maybe this group almost qualified?).

Sorry, I don't have the source (too busy to google for it) but there is a list that can be found on the web showing how many people each country officially executed each year over the past 10 years or so. It breaks down the USA into states with Texas grabbing the lions share. I recall only China (as a whole) tops Texas but my memory is a little sketchy.

Seems that your source failed to mention Communist China, Burma, Vietnam, Tibet, Cambodia, Laos, Haiti, Cuba, North Korea, Arab countries, Israel, all of Central & South America and all of Africa. You don't necessarily have to commit murder in the aforementioned countries to get the death penalty. That's a pretty long list.

Life is not easy

No mercy, they don't deserve it, even not halving the sentence... But let's hope they are the real culprits! You kow how Thai police works!