Thailand's are long overdue for an overhaul (gee, I wonder why economic development at the bottom of the economic chain is somewhat stagnant here; and the entire tax code needs an overhaul if they are to get off protective tariffs, and I DO pay my Thai taxes) - but I'm not a citizen here so I have no meaningful input on this besides discussing with my Thai friends.
US tariffs are dumb (and, unfortunately, I am a citizen there because of anchor citizenship - so it has a direct tax effect on me - though my bigger concern is value of the US dollar and the general international order) - because the US has a developed industrial base and capitalism works on the basis of added value to an existing commodity, and the US doesn't have the manpower for an integrated and domestic vertical supply chain... unless you'd like a planned economy?