1) Trump is a left-of-center conservative who until recently was actually a Democrat. He's not Hitler. He's not going to eat your babies or throw you out of the country because your grandmother was Mexican.
Correction: Mr. Trump was a left-leaning Democrat. President Trump is a wildcard with no real plan or policies aside from building a wall, all backed by an evangelical vice-president and a very troubled Republican party.
2) Trump is a sane human being who has no intention of starting any wars or launching any nukes.
That's not what he said, and what he said is all we have to work off. You're ascribing intent to him that he has never expressed. The real answer is that we don't know.
3) Trump may be inexperienced as a political leader but he's also smart enough to delegate to people who do have experience.
Republican-leaning people, most likely, who can still do significant damage in many areas such as social policies, healthcare, environmental policies, etc. "Experience" can have many definitions and people will still have leanings even with experience.
4) Canada has its own problems. They just elected their own dumb himbo as leader and their economy isn't exactly booming. They also are trying to enact some pretty repressive anti-free-speech laws and continue to be plagued by division between French separatists in Quebec and the English in the rest of the country. Paradise it ain't. If you go there, you're probably in for some harsh awakenings.
Trudeau has yet to show any significant issue, so calling him a "dumb himbo" is really just showing your own biases. Those "repressive anti-free-speech laws" aren't very popular and aren't all that different from what many conservatives want to implement in the US. Finally, separatists, a problem? There hasn't been a majority separatist government in well over a decade. To keep raising that particular specter is completely baseless and farcical.