Can you point out why succeeding spectacularly needs someone to be an asshole? Is it a US specific thing?
Sure, after you’re dead people will look back and think you were great, but while you’re in the process in any competitive endeavor you necessarily are not going to be liked by the people you’re competing against, especially if you’re winning.
Take the late president of India. Did every single person in India vote for him? Did everyone agree with everything he proposed? He had no opposition? I know absolutely nothing about Indian politics, but I bet there were people who didn’t like him while he was in office.
“I better be nice and not do anything that anyone might object to” is not an attitude that leads to success.
And MLK, really???? You think nobody thought he was an asshole? You know they murdered him right? Do you think the people who killed him said he was a great guy?
What you cannot do is compete in the highest level at any field while caring about things like "will people think I'm a wanker?". If you are succeeding spectacularly at anything, there are guaranteed to be thousands, if not millions, of people who think you're a wanker. Look at people at the top of anything and look at what people say about them.