+++Do you have a job? Do you have a supervisor? If you go to the supervisor and ask if you should do such and such, and the supervisor says "sure go ahead", the responsibility then rests with the supervisor and NOT with the person who sought and received the authority to act, in this case the Umpire. It's all about chain of command.
"If you can show me how the speaking of Spanish makes players hit, field and pitch better, let me know."
It gives one team a toll the other doesn't have. Plus if the 2 visits to the pitchers mound is in effect the manager does not have to go to the mound to issue instructions to his pitcher (2 visits by the coach and the pitcher must be removed)but can instead speak from the sidelines in Spanish thereby circumventing the rule.
"The game is still played on the field.
Correct and no team shall have any advantage over another except in physical ability. Coaching can vary by the coach and his methods but what is available to one team must be available to the other. If these Spanish kids are playing here then it is incumbent upon them to learn the language.
You seem to be even more adept at speaking kharaku's second language than he is ... is it dark where your head is planted?
Speaking Spanish on the field isn't really an advantage. All the opposing team needs to do is have one player or coach who speaks Spanish, and the Spanish-speaking team is screwed. That's why a system of hand signals works better, since it is much harder to break.
I agree with your first point (with a few reservations given we don't really have too much info about what the ump and the sup said to each other). I wonder what other rules the ump did not know about (and I'd be very surprised if the Spanish speaking coach violated any written regulation).
Your last point (about Spanish speaking players playing here need to learn the language) makes me wonder if your issue really has anything to do with baseball, or whether this is about something else.
Where is the rule prohibiting players from having knowledge or experience that others lack?