parshanut torah comment - Why were the Jews punished for 40 years if the spies were the ones who were there for 40 days?

Rashi (Bemidbar 13:25) implies that the Jews were in the Sinai Desert for 40 years in response to the spies being in the Land of Israel for 40 days.

While the spies had 40 days worth of planning to sin, and thus were punished, why were the Jews punished for merely accepting the spies’ report? What do they have to do with the 40 days?