Out of curiosity I did a quick Wikipedia check for total deaths in major racing sports categories as compared to the 32 mentioned in the article in NASCAR...

- F1: 45 (last death in 2015 and the one before in 1994)

- Le Mans: 22 (last death in 2013 and the one before in 1997)

- World Rally: 25 (last deaths in 2006 and 2005 and another in 1993)

- MotoGP: 103 (last deaths in 2016, 2011, 2010, 2003)

- Indy: 95 (last deaths in 2015, 2011, 2006, 2003)

- NASCAR Cup: 32 (last two deaths in 2001 according to Wikipedia)