I agree with your point, but will split hairs on using the word "terrorism". I think that should be reserved for people that commit atrocities for some political aim. I'm fairly sure the company in question (I assume Union Carbide) did not poison the town to advance a political agenda.

Russia has a town called Asbest which has an open-pit asbestos mine half the size of Manhattan where they mine with explosives.

https://en.wikipedia.org/wiki/Asbest

https://www.youtube.com/watch?v=cy3piCUPIkc - VICE documentary and visit video. I think it contains an interview with an American woman who suffered from WR Grace and Company's asbestos mining and manufacturing in the USA, she says "they knew, they knew". WRG faced 129,000 personal injury claims and set asude $3 Bn for settling asbestos related lawsuits.

Are you talking about Bhopal in 1984? If so it would be an understatement to refer to half a million people as a “town”, and an overstatement to imply it was terrorism. Willful negligence, yes, but terrorism, no.