Because Grider's proclamations were incorrect. Grider presumptuously spoke for God in his statements. He acted as a prophet and therefore he should be tested against scripture.
The proof I require is exactly what the Bible states:
Deut 18:20 But the prophet who shall speak a word presumptuously in My name which I have not commanded him to speak... that prophet shall die. 21 And you may say in your heart, `How shall we know the word which the Lord has not spoken?' When a prophet speaks in the name of the Lord, if the thing does not come about or come true, that is the thing which the Lord has not spoken. The prophet has spoken it presumptuously. Do not be afraid of him.
Jer 23:32 “Indeed, I am against those who prophesy false dreams,” declares the Lord. “They tell them and lead my people astray with their reckless lies, yet I did not send or appoint them.”
Jer 23:25 “I have heard what the prophets say who prophesy lies in my name. They say, ‘I had a dream! I had a dream!’ 26 How long will this continue in the hearts of these lying prophets, who prophesy delusions of their own minds?
Are you kidding? God commands Christians to test the spirits. It's not a suggestion -
1 Jn 4:1 Dear friends, do not believe every spirit, but test the spirits to see whether they are from God, because many false prophets have gone out into the world.
Did the Bible berate the Bereans for daring to question and test Paul? No. Instead they were commended as noble -
Acts 17:10 As soon as it was night, the brothers sent Paul and Silas away to Berea. On arriving there, they went to the Jewish synagogue. 11 Now the Bereans were of more noble character than the Thessalonians, for they received the message with great eagerness and examined the Scriptures every day to see if what Paul said was true.
You know who demands we accept their words without question, and are offended when we don't? False teachers and prophets, that's who.
Pointing out falsehoods is the right thing to do, esp. when it comes to anyone claiming to speak for God.
I didn't present any speculations as a truth directly from God. The author did, as did you, therefore the burden of proof is on both of you.
I could be wrong but what I'm getting from your statement above is that you didn't personally hear from the Lord but jumped to several conclusions and presented them as truth, as if it was from the Lord [?].
Again, did God tell you He sent the rain to stop the festival but then was giving people a chance to exit? If not, how did you come to that specific conclusion and how can you proclaim it as being from God Himself?
Anyone can say "God proclaims..." or "God has brought this rain/hurricane/earthquake...". That doesn't make it true, hence all of the warnings about false prophets. All of these proclamations and assumptions must be compared to scripture and pass God's own strict guidelines.
It is never wrong to put anyone to the Biblical test. It is extremely wrong to tell us we must have faith in someone's 'prophecy' without testing the spirits for truth and accuracy.