If and when people post ideas at times some within the community will like them and some will not like them. You just have to take the rough with the smooth.
Can't remove posts or tell people to support an idea when all they are doing is saying whats on thier minds.
Now if you don't like their comments then ignore them and move on to other peoples comments.
Also remember if you feel it's a good idea you have to fight for it and keep it interesting and within the rules.