Joan Conrow, The large amount contributed to federal candidates shows that Monsanto wants to influence legislation.  It counters Joni Kamiya's statement that legislators act independently.  
You claim that the bill would allow "any citizen who believed he'd been harmed by pesticides to bring a civil suit."  I wonder if you could point out where that provision is in the bill: 
 http://www.capitol.hawaii.gov/session2017/bills/SB804_HD1_.htm  
There are lots of studies that show health deficits in people living near agricultural areas where pesticides are applied.  With regards to Hawaii, studies don't show that because the relevant studies have not been performed.  That is the purpose of the bill -- to conduct such a study.  The pesticide companies don't want the study to be performed.