If actual evidence finds the light of day at some time in the future, that same public opinion will force him from the contest. It's obvious that we hold Cruz to a higher standard than Trump, who is an admitted serial adulterer, and has been for decades -- in addition to supporting abortion, Kelo, outsourcing, the hiring of illegals, and actively supporting large numbers of liberal politicians.
By staying in Cruz and Kasich make it much more likely that the GOPe will select the candidate, ignoring the voters entirely.