We trust the website we give our information to. It is https-based (else my browser will tell me) and probably using an ORM that will 99% of the time hash my password. But the javascript layer...
Sorry, call me paranoiac, but i will never trust the javascript of a website. With no webdev experience, i was able to inject js (almost by mistake) three years ago. Moreover, is the js communicating with the backend using https too? How can i check that? Are those js library on the website server, or are they hosted by a third party? I can trust them, but how do i know that no attacker was able to modify those scripts?
Yes, those risks are small, but i'd rather have ublock making those risks closer tho 0 than not, am i wrong?