Critical thinking is the application of reason to generate correct (sound) conclusions, correct still meaning demonstrably correct. It's the only method we have for elucidating implicit truth from evidence, and we can demonstrate when we have done that successfully.
That can mean anything you want it to mean.
OK, thanks. How about it meaning what I just wrote?
One of the insights I've gleaned in the last couple of years is how few people know what critical thinking is. I used to think that the ones who ignored it didn't respect it or felt like it was over their heads, but now I see that they mostly don't know what it is or what it can do. That's the basis of the Dunning-Kruger syndrome, which is not the false belief that one has elevated himself to the level of the cognoscenti, but rather, they are unaware that there is a higher understanding and that there are people who can actually derive correct conclusions and know that they are correct. The D-K crowd are simply unaware that other people don't think like them.
They assume that everybody is just guessing like they are, and that their opinions come from the same kind of thinking as theirs, meaning that they are no more valuable or likely to be correct than their own. It's not that they see themselves as up there. They aren't aware that there is an up there. It's why there are people who don't recognize expertise, and can't tell who to trust or believe. It's why the antivaxxers trust Tucker Carlson more than Dr. Fauci, and why when one gives such people a scientific explanation, they often say, "Well, that's just your opinion." That comment caught my eye. Why would one say that unless they were unaware that one can beliefs that are factual and know that they are correct?
Your comment suggests that to me. You seem to imply that critical thinking is anything the critical thinker wants it to be. It's not, just as adding is not whatever the adder wants it to be.
Look at what the anti-vaxxers endured for their false belief, including losing their jobs and being excluded from a large part of public life. Ask them if they felt persecuted. What was the motive for them creating and spreading the belief that the vaccine was more dangerous than the virus?
False belief? They were right.
Here's a place where critical thinking would help you. They were wrong then and they still are, although the relative risk of being unvaccinated has fallen as the world has begun developing a higher level of immunity due to so many others being vaccinated or relatively recently infected - people who are much less likely to be vectors (infected and contagious) at any given time, including themselves if previously infected not too long ago.
And yes, it is possible to know what I just wrote for a fact, and that those who disagree are incorrect. It's actually quite easy. Only a few numbers and principles are needed.
I've already been called arrogant for holding that position a few times here on RF, pronouncing an idea of theirs wrong after hearing, "That's just your opinion." You might feel the same, especially if you are unfamiliar with interpreting data or doing risk-benefit assessment properly, which I alluded to indirectly when noting that the risk of a lethal Covid infection is falling for everybody, even the unvaccinated.
I'd be interested in your explanation for why you feel that the anti-vaxxers were correct. What do you see as the risks and benefits of vaccination that causes you to conclude that the former is greater? Are you considering all of the risks of infection? Are you aware that this virus infects multiple tissues and organs, and seems to linger in some or all infected people? Are you aware of the long-term risk of a virus making a home in your body? Hepatitis viruses can lead to liver cancer. HPV causes cervical cancer years after infection. Chicken-pox virus (VZV) never leaves, often reactivating as shingles. What can we expect in 20 years in people that were previously infected with this virus, especially those who survived a few cases of Covid unvaccinated and who saw the highest viral loads.
Even the asymptomatic are paying a price:
LUNG
New study into long-term impacts of lung damage after COVID-19 – UKRI
Study examines the effect of long COVID on lung health (medicalnewstoday.com)
KIDNEY
Kidney Damage Another Consequence of 'Long COVID' (webmd.com)
Long-term effects of Covid-19 on the kidney | QJM: An International Journal of Medicine | Oxford Academic (oup.com)
HEART
The COVID Heart—One Year After SARS-CoV-2 Infection, Patients Have an Array of Increased Cardiovascular Risks | Cardiology | JAMA | JAMA Network
COVID-19 (coronavirus): Long-term effects - Mayo Clinic
BRAIN
Severe COVID-19 can trigger drop in IQ similar to aging 20 years, study shows - UPI.com
Study Finds COVID-19 May Lower Intelligence (webmd.com)
As you can see, this is a nuanced calculation that need to compare the short-term and long-term risks of infection versus vaccine. I can also tell you that you are mistaken.