Why do the U.S. territories issue party primary delegates when they can't vote for president?

This is because the territory has to become a state in order to directly vote in government affairs. Anyone in born and raised in US territory (but not in a state) is considered still an American citizen. Therefore, they have a right to vote in matters that are not sponsored by the government. The primaries are party events, and are not sponsored or held by the government. Elections, on the other-hand, are. I hope this makes sense and answers your question! :)

the primaries are accomplished via the political occasion now because of the fact the occasion has individuals in those territory's they provide them a raffle to vote interior the primaries mutually as interior the election for president the form supplies each and each state gets a cretin quantity of electorals therefor giving basically the states the main suitable to vote (there is an exception given to Washington DC giving them the main suitable to vote

Because the parties want to be inclusive. It also helps the party build infrastructure in the territories for local political issues.

that a very good point friend why vote for the primary if you can not vote for the president thats why usa is losing respect toward politics worldwide