One of the most astute things Donald Trump could have done in this situation is that before he went to East Palestine, he had already made full and proper arrangements to have each and every resident moved safely to a safe small town location within Ohio (and not too far away).
Then after distributing the food and water he generously provided, he should have had a public rally where he informed the people that it was extremely hazardous for anyone to remain in that contaminated and polluted area any longer. Given his billions, he could have made some excellent arrangements for everyone to move and resettle, then encouraged them to immediately file law suits (after moving) against as many entities as possible.
This would not only have shown Ohioans that he cared for the ordinary people, but it would have shown America the true leadership required in a president within a crisis, and displayed by Trump. Chances are that East Palestine is finished. But there are scores of small towns in Ohio which are similar, and where these people could have re-established themselves with his help. Sure it may have cost him something, but the goodwill he would have earned would have gone beyond Ohio. Americans understand selfless generosity.