major things that asurs are often blamed of are
1) Destruction of yagnyas and disruption of vedic rituals
2) issuing diktats that they be worshiped
3) attacking swarg and taking it over
i dont see anything wrong in above things
1) naturally all vedic sacrifices and are meant for devatas hence asurs oppose them so what is wrong in that
2) when devatas like agni and indra can be worshiped why not asurs after all they are progeny of same father
3) is it not a duty of a king to expand hi kingdom all kings did that so whats wrong
now let us compare tarkasur and indra
Tarkasur is great devotee who was able get boons from both brahma and Shiva, he won all three lokas and no where is it mentioned that he tormented people of all lokas. He never interfered in shiv parvati marriage etc even though he knew that eventually he would die of their son. when time came he fought heroically and died a hero's death.
Whereas Indra never in his life did penance. simply he will run from pillar to post to keep his throne safe and will even entice mahadeva with manmatha etc. he such a low creature that he on number of occasions attacked defense less pregnant woman and did not even spare their fetuses and even slept with ahalya etc etc
i always wondered why Kartikeya was senapati of these cowardly bunch of idiots and morons and helped them in war.
Best regards
krishna