Well, I think you under estimate how much influence individuals can have. Doesn't matter if the person is "just hollywood." Lots of wealthy people love fame, and being fame adjacent. It is surprisingly cheap to bribe a senator for example, like $10k cheap. I'm sure if Kid Rock or Ted Nugent said something into the previous guy's ears, he'd be quite willing to go along with a lot. People like Alex Jones have gotten people killed from "just talking." May be not world wide, but that is possible.
Mel Gibson is below Andrew Tate in toxic influence, and Tate is more international. Hopefully he pays dearly for his behavior, but it will not erase the influence he has had on culture everywhere.
Things don't matter or as is commonly used, "just politics," until it effects them personally. Hopefully, nothing bad comes out of it, like people thinking wife beating is acceptable, because they know a guy, like Gibson, that relatively gets away with it. I just don't want the effect of ideas written off, out of hand. It may be a single point, but get enough of them together, and there are serious problems.
again you're overestimating the influence of some people
this influence you speak of more than likely only affects a REALLY small portion of the world.
you really think people have the time let alone care to listen to what an actor says? actors already have a bad rep for being actors and being involved in scandals and people world wide have accepted that fact.
no one's gonna go out there and think someone like Mel Gibson is gonna give you some big brain takes on politics or whatnot, they're rich that's it
you're over blowing what you think their effect is on the world
take it from someone who doesn't live in the west,
we really don't give a damn about what some actors there do, stop thinking of them as some sort of avatar of anything just because they're rich and famous, the world doesn't revolve around the US specifically.
this influence you have on culture "everywhere"
is limited to a small target group as of now
please go and actually ask around and look at things from the eyes of people outside your country and nation,
you're forgetting a lot of factors that make people listen to people
for one they're supposed to be on a platform where people actually care to read about their words, WHICH IS NOT THE CASE most of the time, 2nd is their voices have to actually matter for majority of the population and that doesn't seem to be present here, heck
the author of this particular manga has not quoted anything he said that anyone can even infer as problematic,
3rd, people actually need to care enough to follow you or actually need to agree on your world view.
now unless you think majority of the international community is just stupid and would follow Mel Gibson's shit takes because he has money, money he probably wouldn't even give to the international community to actually do bad things anyway, then you're really overacting from seeing him even mentioned