Everybody has an opinion and a right to an opinion
Do your opinions just happen to be the same as mainstream that we are fed?
Or are you influenced by them ?
For example if mainstream said father Christmas was real would you believe that or make your own mind up?
I’m influenced by what I see, read, hear and personally experience Baz, the same as we all are. Difficult to be an ‘original thinker‘ in modern society of course, in an all pervasive, 24hr media/news/opinion saturated environment.
Even more so when certain sources are purposefully impregnated with disinformation and misinformation - from post truth to outright factual fabrication and fantasy! ‘Wheat from chaff’ is a difficult proposition. Bad news, controversy, embellishment and conspiracy sell
way better than conventional news.
I have tried very hard to satisfy myself where the reality lies and form my opinions accordingly (no doubt you have done the same). They are predominantly, although not entirely, mainstream.
For example, I believe that man has had a significant detrimental influence on climate/environment and that action is required. I have reservations about some modelling/projections (and certainly some legislation) but believe the overall premise of the need for action to be justified.
The world is acting on it. Not (I believe) for ulterior (read corrupted) motives or because the scientific advice received is flawed or compromised in some way. There are always outliers of course and those seeking to benefit financially or otherwise.
The vast majority of society believe that action is required - governments are voted in and out on that premise; it is therefore mainstream opinion by definition. I realise that there are
many (many) avenues to shoot holes in that rationale but at the very least, surely, we can accept that it is mainstream for a reason. And that reason may be because it holds some credibility.
The usual accusations levelled at the majority - you know, those without enquiring minds AKA ‘the sheeple’ - are just lazy, convenient commentary. Some might view your example of Father Christmas as being in that category - no offence intended.