Dazai; Lack of magnificent reasons

They are similar in quite a few ways
Not only; They both ended their life in suicide 

But it’s a well known fact that
Mishima hated Dazai, almost to a morbid degree

I think Mishima disliked Dazai’s motivation for suicide 

For Mishima
suicide was a supreme, almost holy, act 

And for such a magnificent act,
an equally supreme motivation must exist

From Mishima’s perspective,
Dazai’s suicide must’ve seemed "a lack of magnificent reasons", or
"easy choice", "escape", or even a "defeat"