Notice they only do this to Republican candidates. They get them begging for forgiveness, which makes them look like wimps - that’s why they can’t understand that it isn’t working against Trump.
Trump has balls, people instinctively respond positively to strength and negatively to weakness. Progressives know this and spineless republiCrats eternally forget it.
It really reminds me of the Wayne’s World movie scene where they tried their standard schtick on a guy that called them on it and they backed away in fear.