I agree tubbo is largely mischaracterized but! I do think that coming to a place and immediately having the naivety and somewhat arrogance to ignore the warnings of people who have lived there longer is .. well,, arrogant. to assume that you are smarter. that's a tubbo flaw. (qtubbo to clarify)
yes he is not horrible and evil and stupid, but he's not a complete victim either, much of what he does is cause massive disruption, that's not bad, but different characters are gonna have opinions on a newbie causing massive change to the power balances of the server (i.e. ignoring warnings and creating huge machines which then gets consequences put on others, and also, trying to install a form of capitalism which would presumably, give him wealth so he could eventually become richer than others)
as much as 'hating arrogant new people' can be tossed around as either good or bad, it is a social phenomenon, for people to.. hate arrogant new people especially in traumatic situations because respect is given to people who have survived it for longer.
it's not 'morally correct' for Islanders to blame and hate qtubbo but I can see why, and his downfall will not be 100% the Islanders fault, he chose to ignore them, to overstep. he didn't HAVE to create those things