Sorry but the bit in bold is still too vague. Some people would consider a relatively sluggish handling bike safe whereas other's feel that a bike with a quick steering response is safer. The shorter wheelbase, steeper steering tube angles and reduced rake and trail of a TT bike will make it quicker handling ("twitchier" to some) than a road bike but it's up to the user to decide if it's safer.

Either way whether the bike has a road frame or a TT frame safety is compromised once the rider drops onto the aero bar pads.