What's all the 'seemingly' commotion about a poem 'must' ryhme?

It's pretty silly, and a reflection of how many kids are on here. There have been non-rhyming poems for as long as there has been poetry. In fact, you would have a hard time publishing a poem that rhymed these days. It seems old-fashioned and juvenile. As to structure, there are very few rules anymore, unless you deliberately set out to write a haiku or sonnet or something that does have a prescribed structure. Let your creativity flow, and ignore the critics.