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We live in post-factic time when anything can be disputed and I think its one of sign of healthy democracy.Dangerous wording there. The ability to dispute stuff is good, but the facts are the facts, and what we think of the shape of the Earth or whodunnit, doesn't change the actual shape of the Earth, nor who actually did it. And sometimes the evidence is overwhelming enough that disputing it is at best a distraction.
> At the end it's just a personal decision of what you want to believe.
I hope for your own sake that you only want to believe true things. Besides, you don't really have a choice: what "choosing to believe" a false thing even means? If you make that choice it's too late already: you can't believe something you know to be false. Maybe you can persuade yourself that you believe it, but… you don't.
You need to distinguish the political ideal, where it is very important that you do not mandate or forbid people from believing any particular thing, from the rational ideal, where you need to recognise that you don't actually have a say in what you believe. Evidence comes your way, and that evidence is supposed to make you believe things to various degrees. The maths of it (probability theory) is intractable, but it is inevitable.
For instance, if you see a green traffic line you probably don't want to walk across that road just yet.