Recently many proposals have been unfairly closed and deleted. I believe this kind of suppression of dissenting ideas and opinions is harmful to the community.
In a community as large and diverse this one, discontent and disagreement will always exist. Ideas can appear unfeasible and impractical to some and at the same time appear realistic and logical to others.
Disagreement is something that should be encouraged, not suppressed. Through careful evaluation of arguments both for and against a particular proposal the community can decide if it is worthy of consideration. The tone of the proposal should not be a factor in this evaluation.
Closing and deleting well argued proposals as "not constructive" goes against the purpose of meta. We should foster the discussion and exchange of ideas. Not all ideas are created equal. Some will be great but some will be terrible. However even the terrible ones should not be removed from the site.