Conventional views are exactly the problem. If the topic is history then modern reinterpretation doesn't actually change the past no matter how many people you get to agree to it. You can't just toss the individual cultures of people that didn't even speak the same language into a blender and say it's all the same just because they kind of have a vaguely similar skin tone.

Most of the people you're wrapping together under the blanket of "European heritage" were at various points in history literally killing each other over cultural differences. A significant portion of the earliest European settlers in North America came here specifically because they were being persecuted in their homelands over cultural differences.

Even under the European Union, no one in Europe would seriously make the argument that there's no cultural difference between the many different European nations. Ignoring that reality in favor of some mythical "white culture" is the practice of race baiting academicians that have more interest in denigrating anyone with pale skin than in actually understanding the intricacies of history and culture..