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A far more accurate statement would be:
Science is always seeking more accurate information and a better explanation -- and doesn't fear to admit that prior data or explanations were wrong or less accurate."
Only ignorant dogmatists who claim they hold "THE TRUTH" fear being wrong or require "PROOF".
Truly, the word "proof" applies in Mathematics not Science.
Science uses the word "theory" suggesting future investigations and resulting theories may supplant, modify or extend present theories - e.g. Newtonian physics, Relativity and Quantum Mechanics. The confidence we may have in a theory is directly tied to its surviving repeated attempts to falsify it (Popper et al.)
Indeed, the phrase "law" is rarely used in Science, e.g. the Second Law of Thermodynamics.
Moreover, the search for "truth" is the domain of Theology/Philosophy not Science.
Problems arise when scientists do politics or theology under the color of Science, e.g. Dawkins, Singer, Pinker, Lewontin. But we should not assume that because some do this that they all do this.