Not really.... many years ago, let's say 100, Tsunamis and earthquakes would kill thousands in Japan. Nowadays similar catastrophes hardly kill anybody. Same rules apply for hurricanes in the USA. Remember the Hurrican that destroyed Galveston roughly 100 years ago? Currently stronger hurricanes hardly kill a dozen people.
Yeah, it's because we have radar now. And Japan has built buildings that are more resistant to earthquakes and they have an early warning system because they have a lot of tidal waves. We get a lot of hurricanes and Japan gets a lot of earthquakes and tsunamis, so it pays to invest in early warning systems.
The last tsunami of any significance to affect the Indian Ocean was when Krakatoa exploded, and that was, what? Late 19th century? They simply don't have big tsunamis in the Indian Ocean all that often. It has nothing to do with being civilized, and everything to do with cost outweighing risks. It would be like England investing in a big tornado early warning system. It's not unheard of, but tornadoes simply aren't very common in England, so an early warning system is not a wise use of resources.