Would it be fair to say you were also “concerned” about Ronald Reagan’s past record as a registered democrat? How about Reagan’s past record being a union activist?
Trump has been a private citizen so far. He could support any politician to grease the skids of his highly successful business. He was never a republican official. Therefore he was free to donate to whichever politician to prevent attacks on his business interests. What would be Trump’s purpose at this stage in his life (nearing age 70) to obfuscate his real intentions? Is it possible he sees where the country is going and wants to change the direction? May be that is the legacy he wants to leave behind.