Questions like this should be deleted after they are tagged duplicate? please justify your answer.
From Help Center:
The fundamental goal of closing duplicate questions is to help people find the right answer by getting all of those answers in one place. This does not mean that every duplicate will immediately be closed; we love (some) dupes.
Should duplicates be deleted?
In general, no: most duplicates stay around. Having multiple copies of the same question with different wording is useful as search fodder, because people looking for an answer may use different wording too.
Duplicates that are word-for-word copies or that are so poorly written that they are not useful may be deleted by users with sufficient privilege.
Visit the blog dedicated to Handling Duplicate Questions
Following meta posts may also useful:
Duplicate question etiquette: to delete or not to delete? - your/this case
You should not delete answer if
Your wording is different and may be useful to others
Your question have good answer(s)
But in this case, question doesn't have any good answer and wording is similar. So, you may delete your question thought it is up to you.