From what I've seen, at least in the US, it's mostly conservatives that bring up those arguments to cease support, seemingly stemming from the whole "Zelensky didn't get dirt on Biden for Trump, so he's evil and corrupt!" thing. I don't know if it's different elsewhere.
Look into Chomsky as an example of the common thought on the left. The mindset is pervasive, which isn't to say that many on the far-right aren't just as guilty if not guiltier, given their far reach with the help of people like Musk.