In theory if someone wrote Donald Trump a letter demanding he commit suicide for his crimes against Minorities and Women would it be illegal?

No, your right it was plainly a demand not a threat.

If your goal is to be interrogated by the FBI and put on the no fly list, go right ahead. You don't need to actually commit a crime for them to become very, very interested in you. 

no. You're merely practicing free speech. The government is prohibited from criminilizating it where it'd be for tolerance issues in a librul gov't or a blasphemy issues in a con gov't.

Yes. It is a threat and the FBI will find you.

It would probably be read and destroyed before he could read it.

Yes. Soliciting suicide is illegal and has put some people in prison.

i think if kathy griffin can hold trumps fake severed head on national tv you wont have a problem lol ...

I sent this on to the Secret Service.  They'll let you know shortly. 

I  think you should test this theory. 

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