I don't think eliminating those is a good idea; some questions deal directly with the for loop, such as questions about expanding a for(a;b;c){d} into a while() loop.
The same thing applies with forms. There are questions that deal directly with forms, so the form tag is very applicable there. However, if you see questions with a for loop that have a for-loop edited in, reject the edit, roll it back, or edit the tags out
Here are some questions that I think are good usage of for-loop
