Why did Szilard and other scientists oppose using the atomic bomb?

Szilard, adamant that the atomic bomb would have disastrous geopolitical consequences, crafted a petition arguing that atomic attacks on Japan "could not be justified, at least not until the terms which will be imposed after the war on Japan were made public in detail and Japan were given an opportunity to surrender." That demand was in fact more moderate than Szilard’s original proposition, which pleaded for the use of the bomb to be avoided at all costs

Explanation:

c) they were beaten and fired from their jobs.