Why did Hashem confer the title of "ha'Resha'im ha'Eileh" upon Dasan and Aviram more that on the two hundred and fifty men.
Targum Yonasan: Hashem was referring to the numerous times that they were Chayav Misah since their youth.
They were the ones who revealed to Par'oh that Moshe killed the Egyptian; they were the ones who angered Hashem by the Yam-Suf; They were the ones who grumbled about the Manna in Alush and they were the ones who broke the Shabbos to look for Manna. Refer also to Sh'mos, 5:20:1:2.
Why would anyone who was found in the vicinity of Dasan and Aviram or who touched anything belonging to them perish?
Ramban #1: The Pasuk needs to be inverted