You need to find ways to disentangle yourself from the family drama. Disengage as much as possible. Arguing with it tends to make things worse.
But a lot of the highly volatile topics dont have any like that, because actually doing so would be immoral or unrealistic to actually test.
Things that can't be tested can still be checked against known good mental models and historical incidents.
There is an endless stream of discussions from often quite knowledgeable people doing various meta analysis, showing how there is no/negligible danger, how the tests do not actually work, that the virus is older then 2019 - with the only change being that we now pay attention to it and so much more.
As a software/devops engineer, i feel unqualified to have an opinion on the matter.
What you are describing is really an issue of unhealthy social dynamics. It has nothing to do with the question you asked and everything to do with knowing how to handle people.
It's perfectly fine to not have an opinion on every topic under the sun. People who have and share strong opinions on things they are ignorant about are called blowhards.
Just don't discuss things you don't know enough about to have an informed opinion about. Don't let people drag you into discussions of such things.
At most, listen politely. If that's making you uncomfortable or they are insisting you agree with them or insisting you act on their opinion, don't engage. Shut it down.
I know my government (germany) to be corrupt beyond any doubt.
"The News" tends to be bad news and focuses on everything that goes wrong. No one is perfect and people make mistakes and that's reality, but listening too much to the news will convince you things are worse than they really are.
There is a global health crisis ongoing, so people are stressed out. You see more social weirdness during this kind of crisis.
Politely let people know "I know you are stressed out about all of this. So am I. And for my own mental health, I just can't discuss this with you. Thank you for understanding."
As for actual actionable decisions related to the pandemic, it doesn't matter where the virus came from. It matters that you protect your health and make choices rooted in what kind of future you want.
If travel is an important part of your life, you likely need to vaccinate to keep doing that. So look to your future and questions like that, not to the past and drama surrounding questions of how we got here.
Understanding how we got here can be valuable sometimes for resolving a problem. But that's not what your family is doing.
Ignore all that. Think about what you need to do to not get sick, not get fired from your job, not end up barred from things that matter to you, etc.