Exploding bugs sounds like something Hagrid might want to use in his Care of Magical Creatures classes.
Mostly I think there are more people seeing bugs (and other forms of wildlife...i.e. deer, moose, bears, ((yes, and the lions and tigers, too)) because there are..........
1. Lots more people than there used to be, and............................
2. more development in what used to be natural and rural areas because all those "new" people need places to live.
Or maybe it's something much more sinister, like all of the animals slowly moving into position to "control" the humans when the secret signal is given.
(my pills??? where are my pills?????)