What’s wrong with extreme viewpoints?
It isn’t just the position of those extreme viewpoints themselves, but the process they tend to create.
People who adopt extreme views usually don’t stay static, as these people often tend to keep moving further in that direction over time. As that happens, the worldview becomes narrower and more rigid, until only a very specific way of thinking or behaving is considered acceptable. Once that point is reached, disagreement stops being treated as disagreement and starts being scrutinized as moral failure. That scrutiny often turns into scorn, and eventually into some form of punishment or exclusion.
There’s also a practical issue, stated below.
If the broader population isn’t in a situation where those extreme views actually align with what they need or want, the effect is often the opposite of what’s intended. People don’t just stop following what is currently being preached, but rather, they start rejecting the message and even considering the opposing viewpoint instead. After the situation reaches a certain point, ideas stop feeling like solutions to problems and start feeling actively detrimental to everyday concerns. Instead of building support, extremism ends up pushing people away.
It gets even worse when the definition of what’s “acceptable” keeps shrinking. Views that were considered fine yesterday suddenly aren’t acceptable today, and people who still hold those earlier, more moderate positions get pushed into the wayside, even if they never agreed with it in the first place.
At that point, extremism doesn’t strengthen a movement. It fractures it and creates the backlash it claims to oppose.