1)
How is the generation Tahor in its eyes?
1.
Malbim (Derech ha'Muskal): Even though it was not washed from its excrement, they say that they do not need deeds according to Torah, nor to sanctify and wash from desires and every bad Midah. They say that there is no Torah or Divine creed. They do all abominations that arise on the Ru'ach of their desires. They say that they conduct based on the blend of physicality and its Midos and natures - all that crosses their Ru'ach and desire of their animalistic Nefesh.
2.
Malbim (Derech ha'Pashut): Even though they do every abomination and did not wash from their excrement (they consider themselves virtuous).