A new airline, if it wants to survive, usually needs to expand as fast as possible by leasing either new or used aircraft (depending whether you're at early, mid or late stages o the game), and you need money for this. With the limited amount of funds you have ($7.5 million), you would only be, to put into perspectinve, able to lease 2 new 737-400s. If you decide to play safe and not take bonds, it would take a relatively slow time to expand because your initial daily operating profit will be too low to lease more aircraft and have a steady flow of deliveries (if in early stages).
Remember, before a new set of deliveries could take place, you'd have to wait at the least 2x the amount of time it takes to receive one such aircraft. So if I ordered 2 737s, I would receive the first 737 in 4 weeks, while the next 737 will be received in 2 weeks. Now, if I leased 3 additional 737 after I received the second, I'd have to wait for 4 weeks before I can receive the next set of 737s.
Long story short, bonds make you expand quicker by giving you more cash, allowing you to lease more aircraft and (if no used aircraft are available) have a steady flow of aircraft deliveries.
Yes, bonds can shatter your airline quickly, but if and only if you don't manage your finances well (and in AE, managing finances is absolutely easy). Simply put, the benefits of taking bonds outweigh the potential risk of your airline's assets being liquidated.