How to fix validator.w3.org errors on third party components and modules?

Question

Joomla

I decided to check my site on joomla with a validator - there are many third-party and well-known components, for example, the kunena forum or uptolike social buttons.
The problem is that these and other components create a lot of validation errors.
For example, in kunena there are links containing "&" - and the validator says you need to put &.
Social buttons contain allegedly invalid attributes in html elements. Although the creators of the buttons say that this is the norm.
If you use a validator, then it gives up to a hundred errors on the page. Deal with each separately? Find out what error is "permissible" and what is not? This is nonsense! I can't figure out every single page in a year!
Temporarily disable modules and components? Same - is it an option?
Well, how to be? I would like to use some kind of automatic page validation tool, but it turns out that validator.w3.org cannot be used.