to answer the OP “Are public displays of Frum support of Trump a safe thing?”
No. The Ribono shel olam hates chanifa. The Gemara Sota (41a) says because of chanifa the Beis Hamikdash is destroyed. Trump’s very being is built on dishonesty, and immorality. These are his defining qualities (something even most of his supporters admit, “true but Rubashkin, or true but embassy…” It is ok to support those actions but to support the man himself?
Very very dangerous