Below are my Four Truths ©, derived from the front-end work I've done in the past years. Although presented as “facts”, I recognize the need for (differences in) interpretation and perspective. Please share your comments if you have them.
All web pages are by default responsive.
Breaking that is a choice. Example: http://motherfuckingwebsite.com/
Actually, it's strange that “responsive” is the different one. Normal websites are responsive. It's the ones that aren't that should be called non-responsive, or “fixed”. For example, when talking about it in sales.