A lot depends on the nodes. But in general you are right.
Tor was made by US law enforcement and intelligence agencies so they can do their thing. Now it's used by literally all of these institutions all over the world. Some of their activities are done to catch criminals or to counter governments, regimes which breaks human rights left and right. People living in countries with censorship use Tor to avoid restrictions. Whistleblowers use Tor to protect themselves while draw attention to corruption and abuse done by governments and corporations. The traffic of the absolute scum covers for all of them.
You see it's like freedom of speech, if there is freedom of speech you have to deal with the fact you'll hear opinions and face expressions that you don't like. The right to express the most abhorrent thoughts protects the right to express the most benevolent ones - and I'm not talking about the most mainstream ones, generally accepted opinions aren't in the need of the protection of freedom of speech.
At endchan on the polru board, some users from a certain country I won't name here but starts with an P and ends with OCCNER use Tor to access the site and tell their opinions about a certain military operation that some would call "special" because they feel threatened by the government and doesn't feel safe. Meanwhile some users form the same country use Tor to access the site to attack, spam the same board because they don't like what other users tell about that war that should remain unnamed. The two behaviour coexist and they express themselves with the help of the same medium. And all has to live with the fact and coexist. For disabling Tor would mean silencing all the voices.
Also have to remind you that for example the regularly occurring cp spam on this very site and the rest of the imageboards is posted via clearnet.
Also did you know that the streets and sidewalks all around the world, the shops and restrooms, zoos and theaters are used by absolute scum? You just take a walk outside you'll pass all kinds of criminals. You'll see them on telly talking about politics or watch movies created by them. It is possible that right at the moment the greatest country on Earth is led by someone who diddled underage girls on his friend's island.