Get in their head, they have nothing else to lose. They want to have as much fun (IMO) whilst fighting the good guy and to see them try their hardest is probably the most entertaining way to go.
this too, gotta make it for the audience m8
well, ya true on that.in their case it's like the villain is having a private show
I Mean like in any Series(Magical Related),
It would be Interesting if the bad guys win just once.
LOL imagining now if in the final battle in DBZ between Cell and Gohan Cell won and his attack blew up the earth, and then he wouldn't have much else to do, XD
I'm pretty sure bad guys never win or almost never win is because it would seem totally uncalled for and dark if they managed to kill off the main characters themselves and then went on to destroy everything else. It's just not good business since or marketing since.