Adding a question mark to the end of a "How to" or "Where to" sentence appears to be quite common. Here are two examples from this very site:
How to punctuate a list of questions? (link)
Where to put the periods when using a parenthetical sentence? (link)
In my mind, the question mark doesn't belong at all, and it bothers me.
Am I being unreasonable? Is this practice defensible?