It's not about masculinity at all, it's just "pride comes before the fall". That is not gendered. Both men and women are entirely capable of being destructively prideful. The reason Walter is a villain is that his prideful destruction isn't merely a self-destruction. He also tears apart a bunch of other lives, including those of his wife and children. Again, I'm sorry, but gender isn't the issue with this, if it were a woman who carved a path of destruction through her family and community, she would also be a villain. (And of course these stories exist too.)

The binary options you've proposed to somewhat vindicate Walter's choices were not the only options available to him. The whole point is that he's so brilliant that he can take over a whole regional drug trade in like a year. Well I'm sorry, but if he could do that, he could also have put his brilliance toward some other wildly successful business venture that would not have required blowing people up and putting his family in danger from like three different gangs of violent criminals. There were other options besides eating shit from his rich friend and boss.

He did what he did because he liked it, and he's responsible for the damage that did to the people around him.