Preaching to Muslims in Malaysia

Preaching to Muslims is illegal in parts of Malaysia, but recently the Muslim government increased the punishment for anyone who would try to convert Muslims to another religion:

Malaysian State Stiffens Penalties to Stifle Muslim Conversions

This reminds me of an earlier post by Umm Yaqub, which asks why Muslims are scared to let Bibles into Saudi Arabia.

If Islam is clearly true, why are Muslims so desperate to keep people from hearing alternatives?